interface ICoreWebView2

interface ICoreWebView2
  : public IUnknown

WebView2 enables you to host web content using the latest Microsoft Edge browser and web technology.

Summary

Members Descriptions
add_ContainsFullScreenElementChanged Add an event handler for the ContainsFullScreenElementChanged event.
add_ContentLoading Add an event handler for the ContentLoading event.
add_DocumentTitleChanged Add an event handler for the DocumentTitleChanged event.
add_FrameNavigationCompleted Add an event handler for the FrameNavigationCompleted event.
add_FrameNavigationStarting Add an event handler for the FrameNavigationStarting event.
add_HistoryChanged Add an event handler for the HistoryChanged event.
add_NavigationCompleted Add an event handler for the NavigationCompleted event.
add_NavigationStarting Add an event handler for the NavigationStarting event.
add_NewWindowRequested Add an event handler for the NewWindowRequested event.
add_PermissionRequested Add an event handler for the PermissionRequested event.
add_ProcessFailed Add an event handler for the ProcessFailed event.
add_ScriptDialogOpening Add an event handler for the ScriptDialogOpening event.
add_SourceChanged Add an event handler for the SourceChanged event.
add_WebMessageReceived Add an event handler for the WebMessageReceived event.
add_WebResourceRequested Add an event handler for the WebResourceRequested event.
add_WindowCloseRequested Add an event handler for the WindowCloseRequested event.
AddHostObjectToScript Add the provided host object to script running in the WebView with the specified name.
AddScriptToExecuteOnDocumentCreated Add the provided JavaScript to a list of scripts that should be run after the global object has been created, but before the HTML document has been parsed and before any other script included by the HTML document is run.
AddWebResourceRequestedFilter Adds a URI and resource context filter to the WebResourceRequested event.
CallDevToolsProtocolMethod Runs an asynchronous DevToolsProtocol method.
CapturePreview Capture an image of what WebView is displaying.
ExecuteScript Run JavaScript code from the javascript parameter in the current top-level document rendered in the WebView.
get_BrowserProcessId The process ID of the browser process that hosts the WebView.
get_CanGoBack TRUE if the WebView is able to navigate to a previous page in the navigation history.
get_CanGoForward TRUE if the WebView is able to navigate to a next page in the navigation history.
get_ContainsFullScreenElement Indicates if the WebView contains a fullscreen HTML element.
get_DocumentTitle The title for the current top-level document.
get_Settings The ICoreWebView2Settings object contains various modifiable settings for the running WebView.
get_Source The URI of the current top level document.
GetDevToolsProtocolEventReceiver Get a DevTools Protocol event receiver that allows you to subscribe to a DevTools Protocol event.
GoBack Navigates the WebView to the previous page in the navigation history.
GoForward Navigates the WebView to the next page in the navigation history.
Navigate Cause a navigation of the top-level document to run to the specified URI.
NavigateToString Initiates a navigation to htmlContent as source HTML of a new document.
OpenDevToolsWindow Opens the DevTools window for the current document in the WebView.
PostWebMessageAsJson Post the specified webMessage to the top level document in this WebView.
PostWebMessageAsString Posts a message that is a simple string rather than a JSON string representation of a JavaScript object.
Reload Reload the current page.
remove_ContainsFullScreenElementChanged Remove an event handler previously added with add_ContainsFullScreenElementChanged.
remove_ContentLoading Remove an event handler previously added with add_ContentLoading.
remove_DocumentTitleChanged Remove an event handler previously added with add_DocumentTitleChanged.
remove_FrameNavigationCompleted Remove an event handler previously added with add_FrameNavigationCompleted.
remove_FrameNavigationStarting Remove an event handler previously added with add_FrameNavigationStarting.
remove_HistoryChanged Remove an event handler previously added with add_HistoryChanged.
remove_NavigationCompleted Remove an event handler previously added with add_NavigationCompleted.
remove_NavigationStarting Remove an event handler previously added with add_NavigationStarting.
remove_NewWindowRequested Remove an event handler previously added with add_NewWindowRequested.
remove_PermissionRequested Remove an event handler previously added with add_PermissionRequested.
remove_ProcessFailed Remove an event handler previously added with add_ProcessFailed.
remove_ScriptDialogOpening Remove an event handler previously added with add_ScriptDialogOpening.
remove_SourceChanged Remove an event handler previously added with add_SourceChanged.
remove_WebMessageReceived Remove an event handler previously added with add_WebMessageReceived.
remove_WebResourceRequested Remove an event handler previously added with add_WebResourceRequested.
remove_WindowCloseRequested Remove an event handler previously added with add_WindowCloseRequested.
RemoveHostObjectFromScript Remove the host object specified by the name so that it is no longer accessible from JavaScript code in the WebView.
RemoveScriptToExecuteOnDocumentCreated Remove the corresponding JavaScript added using AddScriptToExecuteOnDocumentCreated with the specified script ID.
RemoveWebResourceRequestedFilter Removes a matching WebResource filter that was previously added for the WebResourceRequested event.
Stop Stop all navigations and pending resource fetches. Does not stop scripts.
COREWEBVIEW2_CAPTURE_PREVIEW_IMAGE_FORMAT Specifies the image format for the ICoreWebView2::CapturePreview method.
COREWEBVIEW2_COOKIE_SAME_SITE_KIND Kind of cookie SameSite status used in the ICoreWebView2Cookie interface.
COREWEBVIEW2_KEY_EVENT_KIND Specifies the key event type that triggered an AcceleratorKeyPressed event.
COREWEBVIEW2_MOVE_FOCUS_REASON Specifies the reason for moving focus.
COREWEBVIEW2_PERMISSION_KIND Indicates the type of a permission request.
COREWEBVIEW2_PERMISSION_STATE Specifies the response to a permission request.
COREWEBVIEW2_PHYSICAL_KEY_STATUS Contains the information packed into the LPARAM sent to a Win32 key event.
COREWEBVIEW2_PROCESS_FAILED_KIND Specifies the process failure type used in the ICoreWebView2ProcessFailedEventHandler interface.
COREWEBVIEW2_SCRIPT_DIALOG_KIND Specifies the JavaScript dialog type used in the ICoreWebView2ScriptDialogOpeningEventHandler interface.
COREWEBVIEW2_WEB_ERROR_STATUS Indicates the error status values for web navigations.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT Specifies the web resource request contexts.

Applies to

Product Introduced
WebView2 Win32 0.9.430
WebView2 Win32 Prerelease 0.9.488

Members

add_ContainsFullScreenElementChanged

Add an event handler for the ContainsFullScreenElementChanged event.

public HRESULT add_ContainsFullScreenElementChanged(ICoreWebView2ContainsFullScreenElementChangedEventHandler * eventHandler, EventRegistrationToken * token)

ContainsFullScreenElementChanged triggers when the ContainsFullScreenElement property changes. An HTML element inside the WebView may enter fullscreen to the size of the WebView or leave fullscreen. This event is useful when, for example, a video element requests to go fullscreen. The listener of ContainsFullScreenElementChanged may resize the WebView in response.

    // Register a handler for the ContainsFullScreenChanged event.
    CHECK_FAILURE(m_webView->add_ContainsFullScreenElementChanged(
        Callback<ICoreWebView2ContainsFullScreenElementChangedEventHandler>(
            [this](ICoreWebView2* sender, IUnknown* args) -> HRESULT {
                if (m_fullScreenAllowed)
                {
                    CHECK_FAILURE(
                        sender->get_ContainsFullScreenElement(&m_containsFullscreenElement));
                    if (m_containsFullscreenElement)
                    {
                        EnterFullScreen();
                    }
                    else
                    {
                        ExitFullScreen();
                    }
                }
                return S_OK;
            })
            .Get(),
        nullptr));

add_ContentLoading

Add an event handler for the ContentLoading event.

public HRESULT add_ContentLoading(ICoreWebView2ContentLoadingEventHandler * eventHandler, EventRegistrationToken * token)

ContentLoading triggers before any content is loaded, including scripts added with AddScriptToExecuteOnDocumentCreated. ContentLoading does not trigger if a same page navigation occurs (such as through fragment navigations or history.pushState navigations). This operation follows the NavigationStarting and SourceChanged events and precedes the HistoryChanged and NavigationCompleted events.

add_DocumentTitleChanged

Add an event handler for the DocumentTitleChanged event.

public HRESULT add_DocumentTitleChanged(ICoreWebView2DocumentTitleChangedEventHandler * eventHandler, EventRegistrationToken * token)

DocumentTitleChanged runs when the DocumentTitle property of the WebView changes and may run before or after the NavigationCompleted event.

    // Register a handler for the DocumentTitleChanged event.
    // This handler just announces the new title on the window's title bar.
    CHECK_FAILURE(m_webView->add_DocumentTitleChanged(
        Callback<ICoreWebView2DocumentTitleChangedEventHandler>(
            [this](ICoreWebView2* sender, IUnknown* args) -> HRESULT {
                wil::unique_cotaskmem_string title;
                CHECK_FAILURE(sender->get_DocumentTitle(&title));
                SetWindowText(m_appWindow->GetMainWindow(), title.get());
                return S_OK;
            })
            .Get(),
        &m_documentTitleChangedToken));

add_FrameNavigationCompleted

Add an event handler for the FrameNavigationCompleted event.

public HRESULT add_FrameNavigationCompleted(ICoreWebView2NavigationCompletedEventHandler * eventHandler, EventRegistrationToken * token)

FrameNavigationCompleted triggers when a child frame has completely loaded (body.onload has triggered) or loading stopped with error.

    // Register a handler for the FrameNavigationCompleted event.
    // Check whether the navigation succeeded, and if not, do something.
    CHECK_FAILURE(m_webView->add_FrameNavigationCompleted(
        Callback<ICoreWebView2NavigationCompletedEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2NavigationCompletedEventArgs* args)
                -> HRESULT {
                BOOL success;
                CHECK_FAILURE(args->get_IsSuccess(&success));
                if (!success)
                {
                    COREWEBVIEW2_WEB_ERROR_STATUS webErrorStatus;
                    CHECK_FAILURE(args->get_WebErrorStatus(&webErrorStatus));
                    std::wstring error_msg = WebErrorStatusToString(webErrorStatus);
                    MessageBox(nullptr,
                       (std::wstring(L"IFrame navigation failed with the ") +
                         L"give in error " + error_msg).c_str(),
                       L"Navigation Failure", MB_OK);
                    if (webErrorStatus == COREWEBVIEW2_WEB_ERROR_STATUS_DISCONNECTED)
                    {
                        // Do something here if you want to handle a specific error case.
                        // In most cases this isn't necessary, because the WebView will
                        // display its own error page automatically.
                    }
                }
                return S_OK;
            })
            .Get(),
        &m_frameNavigationCompletedToken));

add_FrameNavigationStarting

Add an event handler for the FrameNavigationStarting event.

public HRESULT add_FrameNavigationStarting(ICoreWebView2NavigationStartingEventHandler * eventHandler, EventRegistrationToken * token)

FrameNavigationStarting triggers when a child frame in the WebView requests permission to navigate to a different URI. Redirects trigger this operation as well.

You may block corresponding navigations until the event handler returns.

    // Register a handler for the FrameNavigationStarting event.
    // This handler will prevent a frame from navigating to a blocked domain.
    CHECK_FAILURE(m_webView->add_FrameNavigationStarting(
        Callback<ICoreWebView2NavigationStartingEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2NavigationStartingEventArgs* args)
                -> HRESULT {
                wil::unique_cotaskmem_string uri;
                CHECK_FAILURE(args->get_Uri(&uri));

                if (ShouldBlockUri(uri.get()))
                {
                    CHECK_FAILURE(args->put_Cancel(true));
                }
                return S_OK;
            })
            .Get(),
        &m_frameNavigationStartingToken));

add_HistoryChanged

Add an event handler for the HistoryChanged event.

public HRESULT add_HistoryChanged(ICoreWebView2HistoryChangedEventHandler * eventHandler, EventRegistrationToken * token)

HistoryChanged listens to the change of navigation history for the top level document. Use HistoryChanged to verify that the CanGoBack or CanGoForward value has changed. HistoryChanged also runs for using GoBackor GoForward. HistoryChanged runs after SourceChanged and ContentLoading.

    // Register a handler for the HistoryChanged event.
    // Update the Back, Forward buttons.
    CHECK_FAILURE(m_webView->add_HistoryChanged(
        Callback<ICoreWebView2HistoryChangedEventHandler>(
            [this](ICoreWebView2* sender, IUnknown* args) -> HRESULT {
                BOOL canGoBack;
                BOOL canGoForward;
                sender->get_CanGoBack(&canGoBack);
                sender->get_CanGoForward(&canGoForward);
                m_toolbar->SetItemEnabled(Toolbar::Item_BackButton, canGoBack);
                m_toolbar->SetItemEnabled(Toolbar::Item_ForwardButton, canGoForward);

                return S_OK;
            })
            .Get(),
        &m_historyChangedToken));

add_NavigationCompleted

Add an event handler for the NavigationCompleted event.

public HRESULT add_NavigationCompleted(ICoreWebView2NavigationCompletedEventHandler * eventHandler, EventRegistrationToken * token)

NavigationCompleted runs when the WebView has completely loaded (body.onload runs) or loading stopped with error.

    // Register a handler for the NavigationCompleted event.
    // Check whether the navigation succeeded, and if not, do something.
    // Also update the Cancel buttons.
    CHECK_FAILURE(m_webView->add_NavigationCompleted(
        Callback<ICoreWebView2NavigationCompletedEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2NavigationCompletedEventArgs* args)
                -> HRESULT {
                BOOL success;
                CHECK_FAILURE(args->get_IsSuccess(&success));
                if (!success)
                {
                    COREWEBVIEW2_WEB_ERROR_STATUS webErrorStatus;
                    CHECK_FAILURE(args->get_WebErrorStatus(&webErrorStatus));
                    if (webErrorStatus == COREWEBVIEW2_WEB_ERROR_STATUS_DISCONNECTED)
                    {
                        // Do something here if you want to handle a specific error case.
                        // In most cases this isn't necessary, because the WebView will
                        // display its own error page automatically.
                    }
                }
                m_toolbar->SetItemEnabled(Toolbar::Item_CancelButton, false);
                m_toolbar->SetItemEnabled(Toolbar::Item_ReloadButton, true);
                return S_OK;
            })
            .Get(),
        &m_navigationCompletedToken));

add_NavigationStarting

Add an event handler for the NavigationStarting event.

public HRESULT add_NavigationStarting(ICoreWebView2NavigationStartingEventHandler * eventHandler, EventRegistrationToken * token)

NavigationStarting runs when the WebView main frame is requesting permission to navigate to a different URI. Redirects trigger this operation as well.

You may block corresponding navigations until the event handler returns.

    // Register a handler for the NavigationStarting event.
    // This handler will check the domain being navigated to, and if the domain
    // matches a list of blocked sites, it will cancel the navigation and
    // possibly display a warning page.  It will also disable JavaScript on
    // selected websites.
    CHECK_FAILURE(m_webView->add_NavigationStarting(
        Callback<ICoreWebView2NavigationStartingEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2NavigationStartingEventArgs* args)
                -> HRESULT {
                wil::unique_cotaskmem_string uri;
                CHECK_FAILURE(args->get_Uri(&uri));

                if (ShouldBlockUri(uri.get()))
                {
                    CHECK_FAILURE(args->put_Cancel(true));

                    // If the user clicked a link to navigate, show a warning page.
                    BOOL userInitiated;
                    CHECK_FAILURE(args->get_IsUserInitiated(&userInitiated));
                    static const PCWSTR htmlContent =
                        L"<h1>Domain Blocked</h1>"
                        L"<p>You've attempted to navigate to a domain in the blocked "
                        L"sites list. Press back to return to the previous page.</p>";
                    CHECK_FAILURE(sender->NavigateToString(htmlContent));
                }
                // Changes to settings will apply at the next navigation, which includes the
                // navigation after a NavigationStarting event.  We can use this to change
                // settings according to what site we're visiting.
                if (ShouldBlockScriptForUri(uri.get()))
                {
                    m_settings->put_IsScriptEnabled(FALSE);
                }
                else
                {
                    m_settings->put_IsScriptEnabled(m_isScriptEnabled);
                }
                static const PCWSTR url_compare_example = L"fourthcoffee.com";
                wil::unique_bstr domain = GetDomainOfUri(uri.get());
                const wchar_t* domains = domain.get();

                if (wcscmp(url_compare_example, domains) == 0)
                {
                    SetUserAgent(L"example_navigation_ua");
                }

                return S_OK;
            })
            .Get(),
        &m_navigationStartingToken));

add_NewWindowRequested

Add an event handler for the NewWindowRequested event.

public HRESULT add_NewWindowRequested(ICoreWebView2NewWindowRequestedEventHandler * eventHandler, EventRegistrationToken * token)

NewWindowRequested runs when content inside the WebView requests to open a new window, such as through window.open. The app passes a target WebView that is considered the opened window.

If a deferral is not taken on the event args, scripts that resulted in the new window that are requested are blocked until the event handler returns. If a deferral is taken, then scripts are blocked until the deferral is completed.

    // Register a handler for the NewWindowRequested event.
    // This handler will defer the event, create a new app window, and then once the
    // new window is ready, it'll provide that new window's WebView as the response to
    // the request.
    CHECK_FAILURE(m_webView->add_NewWindowRequested(
        Callback<ICoreWebView2NewWindowRequestedEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2NewWindowRequestedEventArgs* args) {
                wil::com_ptr<ICoreWebView2Deferral> deferral;
                CHECK_FAILURE(args->GetDeferral(&deferral));
                AppWindow* newAppWindow;

                wil::com_ptr<ICoreWebView2WindowFeatures> windowFeatures;
                CHECK_FAILURE(args->get_WindowFeatures(&windowFeatures));

                RECT windowRect = {0};
                UINT32 left = 0;
                UINT32 top = 0;
                UINT32 height = 0;
                UINT32 width = 0;
                BOOL shouldHaveToolbar = true;

                BOOL hasPosition = FALSE;
                BOOL hasSize = FALSE;
                CHECK_FAILURE(windowFeatures->get_HasPosition(&hasPosition));
                CHECK_FAILURE(windowFeatures->get_HasSize(&hasSize));

                bool useDefaultWindow = true;

                if (!!hasPosition && !!hasSize)
                {
                    CHECK_FAILURE(windowFeatures->get_Left(&left));
                    CHECK_FAILURE(windowFeatures->get_Top(&top));
                    CHECK_FAILURE(windowFeatures->get_Height(&height));
                    CHECK_FAILURE(windowFeatures->get_Width(&width));
                    useDefaultWindow = false;
                }
                CHECK_FAILURE(windowFeatures->get_ShouldDisplayToolbar(&shouldHaveToolbar));

                windowRect.left = left;
                windowRect.right = left + (width < s_minNewWindowSize ? s_minNewWindowSize : width);
                windowRect.top = top;
                windowRect.bottom = top + (height < s_minNewWindowSize ? s_minNewWindowSize : height);
                
                // passing "none" as uri as its a noinitialnavigation
                if (!useDefaultWindow)
                {
                  newAppWindow = new AppWindow(m_creationModeId, L"none", false, nullptr, true, windowRect, !!shouldHaveToolbar);
                }
                else
                {
                  newAppWindow = new AppWindow(m_creationModeId, L"none");
                }
                newAppWindow->m_isPopupWindow = true;
                newAppWindow->m_onWebViewFirstInitialized = [args, deferral, newAppWindow]() {
                    CHECK_FAILURE(args->put_NewWindow(newAppWindow->m_webView.get()));
                    CHECK_FAILURE(args->put_Handled(TRUE));
                    CHECK_FAILURE(deferral->Complete());
                };

                return S_OK;
            })
            .Get(),
        nullptr));

add_PermissionRequested

Add an event handler for the PermissionRequested event.

public HRESULT add_PermissionRequested(ICoreWebView2PermissionRequestedEventHandler * eventHandler, EventRegistrationToken * token)

PermissionRequested runs when content in a WebView requests permission to access some privileged resources.

If a deferral is not taken on the event args, the subsequent scripts are blocked until the event handler returns. If a deferral is taken, the scripts are blocked until the deferral is completed.

    // Register a handler for the PermissionRequested event.
    // This handler prompts the user to allow or deny the request.
    CHECK_FAILURE(m_webView->add_PermissionRequested(
        Callback<ICoreWebView2PermissionRequestedEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2PermissionRequestedEventArgs* args)
                -> HRESULT {
                wil::unique_cotaskmem_string uri;
                COREWEBVIEW2_PERMISSION_KIND kind =
                    COREWEBVIEW2_PERMISSION_KIND_UNKNOWN_PERMISSION;
                BOOL userInitiated = FALSE;

                CHECK_FAILURE(args->get_Uri(&uri));
                CHECK_FAILURE(args->get_PermissionKind(&kind));
                CHECK_FAILURE(args->get_IsUserInitiated(&userInitiated));

                std::wstring message = L"Do you want to grant permission for ";
                message += NameOfPermissionKind(kind);
                message += L" to the website at ";
                message += uri.get();
                message += L"?\n\n";
                message +=
                    (userInitiated ? L"This request came from a user gesture."
                                   : L"This request did not come from a user gesture.");

                int response = MessageBox(
                    nullptr, message.c_str(), L"Permission Request",
                    MB_YESNOCANCEL | MB_ICONWARNING);

                COREWEBVIEW2_PERMISSION_STATE state =
                    response == IDYES
                        ? COREWEBVIEW2_PERMISSION_STATE_ALLOW
                        : response == IDNO ? COREWEBVIEW2_PERMISSION_STATE_DENY
                                           : COREWEBVIEW2_PERMISSION_STATE_DEFAULT;
                CHECK_FAILURE(args->put_State(state));

                return S_OK;
            })
            .Get(),
        &m_permissionRequestedToken));

add_ProcessFailed

Add an event handler for the ProcessFailed event.

public HRESULT add_ProcessFailed(ICoreWebView2ProcessFailedEventHandler * eventHandler, EventRegistrationToken * token)

ProcessFailed runs when a WebView process ends unexpectedly or becomes unresponsive.

    // Register a handler for the ProcessFailed event.
    // This handler checks if the browser process failed, and asks the user if
    // they want to recreate the webview.
    CHECK_FAILURE(m_webView->add_ProcessFailed(
        Callback<ICoreWebView2ProcessFailedEventHandler>(
            [this](ICoreWebView2* sender,
                ICoreWebView2ProcessFailedEventArgs* args) -> HRESULT
    {
        COREWEBVIEW2_PROCESS_FAILED_KIND failureType;
        CHECK_FAILURE(args->get_ProcessFailedKind(&failureType));
        if (failureType == COREWEBVIEW2_PROCESS_FAILED_KIND_BROWSER_PROCESS_EXITED)
        {
            int button = MessageBox(
                m_appWindow->GetMainWindow(),
                L"Browser process exited unexpectedly.  Recreate webview?",
                L"Browser process exited",
                MB_YESNO);
            if (button == IDYES)
            {
                m_appWindow->ReinitializeWebView();
            }
        }
        else if (failureType == COREWEBVIEW2_PROCESS_FAILED_KIND_RENDER_PROCESS_UNRESPONSIVE)
        {
            int button = MessageBox(
                m_appWindow->GetMainWindow(),
                L"Browser render process has stopped responding.  Recreate webview?",
                L"Web page unresponsive", MB_YESNO);
            if (button == IDYES)
            {
                m_appWindow->ReinitializeWebView();
            }
        }
        else if (failureType == COREWEBVIEW2_PROCESS_FAILED_KIND_RENDER_PROCESS_EXITED)
        {
            int button = MessageBox(
                m_appWindow->GetMainWindow(),
                L"Browser render process exited unexpectedly. Reload page?",
                L"Web page unresponsive", MB_YESNO);
            if (button == IDYES)
            {
                CHECK_FAILURE(m_webView->Reload());
            }
        }
        return S_OK;
    }).Get(), &m_processFailedToken));

add_ScriptDialogOpening

Add an event handler for the ScriptDialogOpening event.

public HRESULT add_ScriptDialogOpening(ICoreWebView2ScriptDialogOpeningEventHandler * eventHandler, EventRegistrationToken * token)

ScriptDialogOpening runs when a JavaScript dialog (alert, confirm, prompt, or beforeunload) displays for the webview. This event only triggers if the ICoreWebView2Settings::AreDefaultScriptDialogsEnabled property is set to FALSE. The ScriptDialogOpening event suppresses dialogs or replaces default dialogs with custom dialogs.

If a deferral is not taken on the event args, the subsequent scripts are blocked until the event handler returns. If a deferral is taken, the scripts are blocked until the deferral is completed.

    // Register a handler for the ScriptDialogOpening event.
    // This handler will set up a custom prompt dialog for the user,
    // and may defer the event if the setting to defer dialogs is enabled.
    CHECK_FAILURE(m_webView->add_ScriptDialogOpening(
        Callback<ICoreWebView2ScriptDialogOpeningEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2ScriptDialogOpeningEventArgs* args)
                -> HRESULT {
                wil::com_ptr<ICoreWebView2ScriptDialogOpeningEventArgs> eventArgs = args;
                auto showDialog = [this, eventArgs] {
                    wil::unique_cotaskmem_string uri;
                    COREWEBVIEW2_SCRIPT_DIALOG_KIND type;
                    wil::unique_cotaskmem_string message;
                    wil::unique_cotaskmem_string defaultText;

                    CHECK_FAILURE(eventArgs->get_Uri(&uri));
                    CHECK_FAILURE(eventArgs->get_Kind(&type));
                    CHECK_FAILURE(eventArgs->get_Message(&message));
                    CHECK_FAILURE(eventArgs->get_DefaultText(&defaultText));

                    std::wstring promptString =
                        std::wstring(L"The page at '") + uri.get() + L"' says:";
                    TextInputDialog dialog(
                        m_appWindow->GetMainWindow(), L"Script Dialog", promptString.c_str(),
                        message.get(), defaultText.get(),
                        /* readonly */ type != COREWEBVIEW2_SCRIPT_DIALOG_KIND_PROMPT);
                    if (dialog.confirmed)
                    {
                        CHECK_FAILURE(eventArgs->put_ResultText(dialog.input.c_str()));
                        CHECK_FAILURE(eventArgs->Accept());
                    }
                };

                if (m_deferScriptDialogs)
                {
                    wil::com_ptr<ICoreWebView2Deferral> deferral;
                    CHECK_FAILURE(args->GetDeferral(&deferral));
                    m_completeDeferredDialog = [showDialog, deferral] {
                        showDialog();
                        CHECK_FAILURE(deferral->Complete());
                    };
                }
                else
                {
                    showDialog();
                }

                return S_OK;
            })
            .Get(),
        &m_scriptDialogOpeningToken));

add_SourceChanged

Add an event handler for the SourceChanged event.

public HRESULT add_SourceChanged(ICoreWebView2SourceChangedEventHandler * eventHandler, EventRegistrationToken * token)

SourceChanged triggers when the Source property changes. SourceChanged runs when navigating to a different site or fragment navigations. It does not trigger for other types of navigations such as page refreshes or history.pushState with the same URL as the current page. SourceChanged runs before ContentLoading for navigation to a new document.

    // Register a handler for the SourceChanged event.
    // This handler will read the webview's source URI and update
    // the app's address bar.
    CHECK_FAILURE(m_webView->add_SourceChanged(
        Callback<ICoreWebView2SourceChangedEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2SourceChangedEventArgs* args)
                -> HRESULT {
                wil::unique_cotaskmem_string uri;
                sender->get_Source(&uri);
                if (wcscmp(uri.get(), L"about:blank") == 0)
                {
                    uri = wil::make_cotaskmem_string(L"");
                }
                SetWindowText(GetAddressBar(), uri.get());

                return S_OK;
            })
            .Get(),
        &m_sourceChangedToken));

add_WebMessageReceived

Add an event handler for the WebMessageReceived event.

public HRESULT add_WebMessageReceived(ICoreWebView2WebMessageReceivedEventHandler * handler, EventRegistrationToken * token)

WebMessageReceived runs when the ICoreWebView2Settings::IsWebMessageEnabled setting is set and the top-level document of the WebView runs window.chrome.webview.postMessage. The postMessage function is void postMessage(object) where object is any object supported by JSON conversion.

        window.chrome.webview.addEventListener('message', arg => {
            if ("SetColor" in arg.data) {
                document.getElementById("colorable").style.color = arg.data.SetColor;
            }
            if ("WindowBounds" in arg.data) {
                document.getElementById("window-bounds").value = arg.data.WindowBounds;
            }
        });

        function SetTitleText() {
            let titleText = document.getElementById("title-text");
            window.chrome.webview.postMessage(`SetTitleText ${titleText.value}`);
        }
        function GetWindowBounds() {
            window.chrome.webview.postMessage("GetWindowBounds");
        }

When postMessage is run, the Invoke method of the handler is run with the object parameter of the postMessage converted to a JSON string.

    // Setup the web message received event handler before navigating to
    // ensure we don't miss any messages.
    CHECK_FAILURE(m_webView->add_WebMessageReceived(
        Microsoft::WRL::Callback<ICoreWebView2WebMessageReceivedEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2WebMessageReceivedEventArgs* args)
    {
        wil::unique_cotaskmem_string uri;
        CHECK_FAILURE(args->get_Source(&uri));

        // Always validate that the origin of the message is what you expect.
        if (uri.get() != m_sampleUri)
        {
            return S_OK;
        }
        wil::unique_cotaskmem_string messageRaw;
        CHECK_FAILURE(args->TryGetWebMessageAsString(&messageRaw));
        std::wstring message = messageRaw.get();

        if (message.compare(0, 13, L"SetTitleText ") == 0)
        {
            m_appWindow->SetTitleText(message.substr(13).c_str());
        }
        else if (message.compare(L"GetWindowBounds") == 0)
        {
            RECT bounds = m_appWindow->GetWindowBounds();
            std::wstring reply =
                L"{\"WindowBounds\":\"Left:" + std::to_wstring(bounds.left)
                + L"\\nTop:" + std::to_wstring(bounds.top)
                + L"\\nRight:" + std::to_wstring(bounds.right)
                + L"\\nBottom:" + std::to_wstring(bounds.bottom)
                + L"\"}";
            CHECK_FAILURE(sender->PostWebMessageAsJson(reply.c_str()));
        }
        return S_OK;
    }).Get(), &m_webMessageReceivedToken));

add_WebResourceRequested

Add an event handler for the WebResourceRequested event.

public HRESULT add_WebResourceRequested(ICoreWebView2WebResourceRequestedEventHandler * eventHandler, EventRegistrationToken * token)

WebResourceRequested runs when the WebView is performing a URL request to a matching URL and resource context filter that was added with AddWebResourceRequestedFilter. At least one filter must be added for the event to run.

The web resource requested may be blocked until the event handler returns if a deferral is not taken on the event args. If a deferral is taken, then the web resource requested is blocked until the deferral is completed.

        if (m_blockImages)
        {
            m_webView->AddWebResourceRequestedFilter(
                L"*", COREWEBVIEW2_WEB_RESOURCE_CONTEXT_IMAGE);
            CHECK_FAILURE(m_webView->add_WebResourceRequested(
                Callback<ICoreWebView2WebResourceRequestedEventHandler>(
                    [this](
                        ICoreWebView2* sender,
                        ICoreWebView2WebResourceRequestedEventArgs* args) {
                        COREWEBVIEW2_WEB_RESOURCE_CONTEXT resourceContext;
                        CHECK_FAILURE(args->get_ResourceContext(&resourceContext));
                        // Ensure that the type is image
                        if (resourceContext != COREWEBVIEW2_WEB_RESOURCE_CONTEXT_IMAGE)
                        {
                            return E_INVALIDARG;
                        }
                        // Override the response with an empty one to block the image.
                        // If put_Response is not called, the request will continue as normal.
                        wil::com_ptr<ICoreWebView2WebResourceResponse> response;
                        wil::com_ptr<ICoreWebView2Environment> environment;
                        wil::com_ptr<ICoreWebView2_2> webview2;
                        CHECK_FAILURE(m_webView->QueryInterface(IID_PPV_ARGS(&webview2)));
                        CHECK_FAILURE(webview2->get_Environment(&environment));
                        CHECK_FAILURE(environment->CreateWebResourceResponse(
                            nullptr, 403 /*NoContent*/, L"Blocked", L"", &response));
                        CHECK_FAILURE(args->put_Response(response.get()));
                        return S_OK;
                    })
                    .Get(),
                &m_webResourceRequestedTokenForImageBlocking));
        }
        else
        {
            CHECK_FAILURE(m_webView->remove_WebResourceRequested(
                m_webResourceRequestedTokenForImageBlocking));
        }

add_WindowCloseRequested

Add an event handler for the WindowCloseRequested event.

public HRESULT add_WindowCloseRequested(ICoreWebView2WindowCloseRequestedEventHandler * eventHandler, EventRegistrationToken * token)

WindowCloseRequested triggers when content inside the WebView requested to close the window, such as after window.close is run. The app should close the WebView and related app window if that makes sense to the app.

    // Register a handler for the WindowCloseRequested event.
    // This handler will close the app window if it is not the main window.
    CHECK_FAILURE(m_webView->add_WindowCloseRequested(
        Callback<ICoreWebView2WindowCloseRequestedEventHandler>([this](
                                                                    ICoreWebView2* sender,
                                                                    IUnknown* args) {
            if (m_isPopupWindow)
            {
                CloseAppWindow();
            }
            return S_OK;
        }).Get(),
        nullptr));

AddHostObjectToScript

Add the provided host object to script running in the WebView with the specified name.

public HRESULT AddHostObjectToScript(LPCWSTR name, VARIANT * object)

Host objects are exposed as host object proxies using window.chrome.webview.hostObjects.{name}. Host object proxies are promises and resolves to an object representing the host object. The promise is rejected if the app has not added an object with the name. When JavaScript code access a property or method of the object, a promise is return, which resolves to the value returned from the host for the property or method, or rejected in case of error, for example, no property or method on the object or parameters are not valid.

Note

While simple types, IDispatch and array are supported, generic IUnknown, VT_DECIMAL, or VT_RECORD variant is not supported. Remote JavaScript objects like callback functions are represented as an VT_DISPATCH``VARIANT with the object implementing IDispatch. The JavaScript callback method may be invoked using DISPID_VALUE for the DISPID. Nested arrays are supported up to a depth of 3. Arrays of by reference types are not supported. VT_EMPTY and VT_NULL are mapped into JavaScript as null. In JavaScript, null and undefined are mapped to VT_EMPTY.

Additionally, all host objects are exposed as window.chrome.webview.hostObjects.sync.{name}. Here the host objects are exposed as synchronous host object proxies. These are not promises and function runtimes or property access synchronously block running script waiting to communicate cross process for the host code to run. Accordingly the result may have reliability issues and it is recommended that you use the promise-based asynchronous window.chrome.webview.hostObjects.{name} API.

Synchronous host object proxies and asynchronous host object proxies may both use a proxy to the same host object. Remote changes made by one proxy propagates to any other proxy of that same host object whether the other proxies and synchronous or asynchronous.

While JavaScript is blocked on a synchronous run to native code, that native code is unable to run back to JavaScript. Attempts to do so fail with HRESULT_FROM_WIN32(ERROR_POSSIBLE_DEADLOCK).

Host object proxies are JavaScript Proxy objects that intercept all property get, property set, and method invocations. Properties or methods that are a part of the Function or Object prototype are run locally. Additionally any property or method in the chrome.webview.hostObjects.options.forceLocalProperties array are also run locally. This defaults to including optional methods that have meaning in JavaScript like toJSON and Symbol.toPrimitive. Add more to the array as required.

The chrome.webview.hostObjects.cleanupSome method performs a best effort garbage collection on host object proxies.

Host object proxies additionally have the following methods which run locally.

Method name Details
applyHostFunction, getHostProperty, setHostProperty Perform a method invocation, property get, or property set on the host object. Use the methods to explicitly force a method or property to run remotely if a conflicting local method or property exists. For instance, proxy.toString() runs the local toString method on the proxy object. But proxy.applyHostFunction('toString') runs toString on the host proxied object instead.
getLocalProperty, setLocalProperty Perform property get, or property set locally. Use the methods to force getting or setting a property on the host object proxy rather than on the host object it represents. For instance, proxy.unknownProperty gets the property named unknownProperty from the host proxied object. But proxy.getLocalProperty('unknownProperty') gets the value of the property unknownProperty on the proxy object.
sync Asynchronous host object proxies expose a sync method which returns a promise for a synchronous host object proxy for the same host object. For example, chrome.webview.hostObjects.sample.methodCall() returns an asynchronous host object proxy. Use the sync method to obtain a synchronous host object proxy instead: const syncProxy = await chrome.webview.hostObjects.sample.methodCall().sync().
async Synchronous host object proxies expose an async method which blocks and returns an asynchronous host object proxy for the same host object. For example, chrome.webview.hostObjects.sync.sample.methodCall() returns a synchronous host object proxy. Running the async method on this blocks and then returns an asynchronous host object proxy for the same host object: const asyncProxy = chrome.webview.hostObjects.sync.sample.methodCall().async().
then Asynchronous host object proxies have a then method. Allows proxies to be awaitable. then returns a promise that resolves with a representation of the host object. If the proxy represents a JavaScript literal, a copy of that is returned locally. If the proxy represents a function, a non-awaitable proxy is returned. If the proxy represents a JavaScript object with a mix of literal properties and function properties, the a copy of the object is returned with some properties as host object proxies.

All other property and method invocations (other than the above Remote object proxy methods, forceLocalProperties list, and properties on Function and Object prototypes) are run remotely. Asynchronous host object proxies return a promise representing asynchronous completion of remotely invoking the method, or getting the property. The promise resolves after the remote operations complete and the promises resolve to the resulting value of the operation. Synchronous host object proxies work similarly, but block running JavaScript and wait for the remote operation to complete.

Setting a property on an asynchronous host object proxy works slightly differently. The set returns immediately and the return value is the value that is set. This is a requirement of the JavaScript Proxy object. If you need to asynchronously wait for the property set to complete, use the setHostProperty method which returns a promise as described above. Synchronous object property set property synchronously blocks until the property is set.

For example, suppose you have a COM object with the following interface.

    [uuid(3a14c9c0-bc3e-453f-a314-4ce4a0ec81d8), object, local]
    interface IHostObjectSample : IUnknown
    {
        // Demonstrate basic method call with some parameters and a return value.
        HRESULT MethodWithParametersAndReturnValue([in] BSTR stringParameter, [in] INT integerParameter, [out, retval] BSTR* stringResult);

        // Demonstrate getting and setting a property.
        [propget] HRESULT Property([out, retval] BSTR* stringResult);
        [propput] HRESULT Property([in] BSTR stringValue);

        [propget] HRESULT IndexedProperty(INT index, [out, retval] BSTR * stringResult);
        [propput] HRESULT IndexedProperty(INT index, [in] BSTR stringValue);

        // Demonstrate native calling back into JavaScript.
        HRESULT CallCallbackAsynchronously([in] IDispatch* callbackParameter);

    };

Add an instance of this interface into your JavaScript with AddHostObjectToScript. In this case, name it sample.

            VARIANT remoteObjectAsVariant = {};
            m_hostObject.query_to<IDispatch>(&remoteObjectAsVariant.pdispVal);
            remoteObjectAsVariant.vt = VT_DISPATCH;

            // We can call AddHostObjectToScript multiple times in a row without
            // calling RemoveHostObject first. This will replace the previous object
            // with the new object. In our case this is the same object and everything
            // is fine.
            CHECK_FAILURE(
                m_webView->AddHostObjectToScript(L"sample", &remoteObjectAsVariant));
            remoteObjectAsVariant.pdispVal->Release();

In the HTML document, use the COM object using chrome.webview.hostObjects.sample.

        document.getElementById("getPropertyAsyncButton").addEventListener("click", async () => {
        const propertyValue = await chrome.webview.hostObjects.sample.property;
        document.getElementById("getPropertyAsyncOutput").textContent = propertyValue;
        });

        document.getElementById("getPropertySyncButton").addEventListener("click", () => {
        const propertyValue = chrome.webview.hostObjects.sync.sample.property;
        document.getElementById("getPropertySyncOutput").textContent = propertyValue;
        });

        document.getElementById("setPropertyAsyncButton").addEventListener("click", async () => {
        const propertyValue = document.getElementById("setPropertyAsyncInput").value;
        // The following line will work but it will return immediately before the property value has actually been set.
        // If you need to set the property and wait for the property to change value, use the setHostProperty function.
        chrome.webview.hostObjects.sample.property = propertyValue;
        document.getElementById("setPropertyAsyncOutput").textContent = "Set";
        });

        document.getElementById("setPropertyExplicitAsyncButton").addEventListener("click", async () => {
        const propertyValue = document.getElementById("setPropertyExplicitAsyncInput").value;
        // If you care about waiting until the property has actually changed value use the setHostProperty function.
        await chrome.webview.hostObjects.sample.setHostProperty("property", propertyValue);
        document.getElementById("setPropertyExplicitAsyncOutput").textContent = "Set";
        });

        document.getElementById("setPropertySyncButton").addEventListener("click", () => {
        const propertyValue = document.getElementById("setPropertySyncInput").value;
        chrome.webview.hostObjects.sync.sample.property = propertyValue;
        document.getElementById("setPropertySyncOutput").textContent = "Set";
        });

        document.getElementById("getIndexedPropertyAsyncButton").addEventListener("click", async () => {
        const index = parseInt(document.getElementById("getIndexedPropertyAsyncParam").value);
        const resultValue = await chrome.webview.hostObjects.sample.IndexedProperty[index];
        document.getElementById("getIndexedPropertyAsyncOutput").textContent = resultValue;
        });
        document.getElementById("setIndexedPropertyAsyncButton").addEventListener("click", async () => {
        const index = parseInt(document.getElementById("setIndexedPropertyAsyncParam1").value);
        const value = document.getElementById("setIndexedPropertyAsyncParam2").value;;
        chrome.webview.hostObjects.sample.IndexedProperty[index] = value;
        document.getElementById("setIndexedPropertyAsyncOutput").textContent = "Set";
        });
        document.getElementById("invokeMethodAsyncButton").addEventListener("click", async () => {
        const paramValue1 = document.getElementById("invokeMethodAsyncParam1").value;
        const paramValue2 = parseInt(document.getElementById("invokeMethodAsyncParam2").value);
        const resultValue = await chrome.webview.hostObjects.sample.MethodWithParametersAndReturnValue(paramValue1, paramValue2);
        document.getElementById("invokeMethodAsyncOutput").textContent = resultValue;
        });

        document.getElementById("invokeMethodSyncButton").addEventListener("click", () => {
        const paramValue1 = document.getElementById("invokeMethodSyncParam1").value;
        const paramValue2 = parseInt(document.getElementById("invokeMethodSyncParam2").value);
        const resultValue = chrome.webview.hostObjects.sync.sample.MethodWithParametersAndReturnValue(paramValue1, paramValue2);
        document.getElementById("invokeMethodSyncOutput").textContent = resultValue;
        });

        let callbackCount = 0;
        document.getElementById("invokeCallbackButton").addEventListener("click", async () => {
        chrome.webview.hostObjects.sample.CallCallbackAsynchronously(() => {
        document.getElementById("invokeCallbackOutput").textContent = "Native object called the callback " + (++callbackCount) + " time(s).";
        });
        });

Exposing host objects to script has security risk. For more information about best practices, navigate to Best practices for developing secure WebView2 applications.

AddScriptToExecuteOnDocumentCreated

Add the provided JavaScript to a list of scripts that should be run after the global object has been created, but before the HTML document has been parsed and before any other script included by the HTML document is run.

public HRESULT AddScriptToExecuteOnDocumentCreated(LPCWSTR javaScript, ICoreWebView2AddScriptToExecuteOnDocumentCreatedCompletedHandler * handler)

This method injects a script that runs on all top-level document and child frame page navigations. This method runs asynchronously, and you must wait for the completion handler to finish before the injected script is ready to run. When this method completes, the Invoke method of the handler is run with the id of the injected script. id is a string. To remove the injected script, use RemoveScriptToExecuteOnDocumentCreated.

Note

If an HTML document is running in a sandbox of some kind using sandbox properties or the Content-Security-Policy HTTP header affects the script that runs. For example, if the allow-modals keyword is not set then requests to run the alert function are ignored.

// Prompt the user for some script and register it to execute whenever a new page loads.
void ScriptComponent::AddInitializeScript()
{
    TextInputDialog dialog(
        m_appWindow->GetMainWindow(),
        L"Add Initialize Script",
        L"Initialization Script:",
        L"Enter the JavaScript code to run as the initialization script that "
            L"runs before any script in the HTML document.",
    // This example script stops child frames from opening new windows.  Because
    // the initialization script runs before any script in the HTML document, we
    // can trust the results of our checks on window.parent and window.top.
        L"if (window.parent !== window.top) {\r\n"
        L"    delete window.open;\r\n"
        L"}");
    if (dialog.confirmed)
    {
        m_webView->AddScriptToExecuteOnDocumentCreated(
            dialog.input.c_str(),
            Callback<ICoreWebView2AddScriptToExecuteOnDocumentCreatedCompletedHandler>(
                [this](HRESULT error, PCWSTR id) -> HRESULT
        {
            m_lastInitializeScriptId = id;
            MessageBox(nullptr, id, L"AddScriptToExecuteOnDocumentCreated Id", MB_OK);
            return S_OK;
        }).Get());

    }
}

AddWebResourceRequestedFilter

Adds a URI and resource context filter to the WebResourceRequested event.

public HRESULT AddWebResourceRequestedFilter(LPCWSTR const uri, COREWEBVIEW2_WEB_RESOURCE_CONTEXT const resourceContext)

The URI parameter value may be set to a wildcard string (*: zero or more, ?: exactly one). nullptr is equivalent to L"". For more information about resource context filters, navigate to [COREWEBVIEW2_WEB_RESOURCE_CONTEXT].

CallDevToolsProtocolMethod

Runs an asynchronous DevToolsProtocol method.

public HRESULT CallDevToolsProtocolMethod(LPCWSTR methodName, LPCWSTR parametersAsJson, ICoreWebView2CallDevToolsProtocolMethodCompletedHandler * handler)

For more information about available methods, navigate to DevTools Protocol Viewer . The methodName parameter is the full name of the method in the {domain}.{method} format. The parametersAsJson parameter is a JSON formatted string containing the parameters for the corresponding method. The Invoke method of the handler is run when the method asynchronously completes. Invoke is run with the return object of the method as a JSON string.

// Prompt the user for the name and parameters of a CDP method, then call it.
void ScriptComponent::CallCdpMethod()
{
    TextInputDialog dialog(
        m_appWindow->GetMainWindow(),
        L"Call CDP Method",
        L"CDP method name:",
        L"Enter the CDP method name to call, followed by a space,\r\n"
            L"followed by the parameters in JSON format.",
        L"Runtime.evaluate {\"expression\":\"alert(\\\"test\\\")\"}");
    if (dialog.confirmed)
    {
        size_t delimiterPos = dialog.input.find(L' ');
        std::wstring methodName = dialog.input.substr(0, delimiterPos);
        std::wstring methodParams =
            (delimiterPos < dialog.input.size()
                ? dialog.input.substr(delimiterPos + 1)
                : L"{}");

        m_webView->CallDevToolsProtocolMethod(
            methodName.c_str(),
            methodParams.c_str(),
            Callback<ICoreWebView2CallDevToolsProtocolMethodCompletedHandler>(
                [](HRESULT error, PCWSTR resultJson) -> HRESULT
                {
                    MessageBox(nullptr, resultJson, L"CDP Method Result", MB_OK);
                    return S_OK;
                }).Get());
    }
}

CapturePreview

Capture an image of what WebView is displaying.

public HRESULT CapturePreview(COREWEBVIEW2_CAPTURE_PREVIEW_IMAGE_FORMAT imageFormat, IStream * imageStream, ICoreWebView2CapturePreviewCompletedHandler * handler)

Specify the format of the image with the imageFormat parameter. The resulting image binary data is written to the provided imageStream parameter. When CapturePreview finishes writing to the stream, the Invoke method on the provided handler parameter is run.

// Show the user a file selection dialog, then save a screenshot of the WebView
// to the selected file.
void FileComponent::SaveScreenshot()
{
    OPENFILENAME openFileName = {};
    openFileName.lStructSize = sizeof(openFileName);
    openFileName.hwndOwner = nullptr;
    openFileName.hInstance = nullptr;
    WCHAR fileName[MAX_PATH] = L"WebView2_Screenshot.png";
    openFileName.lpstrFile = fileName;
    openFileName.lpstrFilter = L"PNG File\0*.png\0";
    openFileName.nMaxFile = ARRAYSIZE(fileName);
    openFileName.Flags = OFN_OVERWRITEPROMPT;

    if (GetSaveFileName(&openFileName))
    {
        wil::com_ptr<IStream> stream;
        CHECK_FAILURE(SHCreateStreamOnFileEx(
            fileName, STGM_READWRITE | STGM_CREATE, FILE_ATTRIBUTE_NORMAL, TRUE, nullptr,
            &stream));

        HWND mainWindow = m_appWindow->GetMainWindow();

        CHECK_FAILURE(m_webView->CapturePreview(
            COREWEBVIEW2_CAPTURE_PREVIEW_IMAGE_FORMAT_PNG, stream.get(),
            Callback<ICoreWebView2CapturePreviewCompletedHandler>(
                [mainWindow](HRESULT error_code) -> HRESULT {
                    CHECK_FAILURE(error_code);

                    MessageBox(mainWindow, L"Preview Captured", L"Preview Captured", MB_OK);
                    return S_OK;
                })
                .Get()));
    }
}

ExecuteScript

Run JavaScript code from the javascript parameter in the current top-level document rendered in the WebView.

public HRESULT ExecuteScript(LPCWSTR javaScript, ICoreWebView2ExecuteScriptCompletedHandler * handler)

The result of evaluating the provided JavaScript is used in this parameter. The result value is a JSON encoded string. If the result is undefined, contains a reference cycle, or otherwise is not able to be encoded into JSON, the JSON null value is returned as the null string.

Note

A function that has no explicit return value returns undefined. If the script that was run throws an unhandled exception, then the result is also null. This method is applied asynchronously. If the method is run after the NavigationStarting event during a navigation, the script runs in the new document when loading it, around the time ContentLoading is run. This operation works even if ICoreWebView2Settings::IsScriptEnabled is set to FALSE.

// Prompt the user for some script and then execute it.
void ScriptComponent::InjectScript()
{
    TextInputDialog dialog(
        m_appWindow->GetMainWindow(),
        L"Inject Script",
        L"Enter script code:",
        L"Enter the JavaScript code to run in the webview.",
        L"window.getComputedStyle(document.body).backgroundColor");
    if (dialog.confirmed)
    {
        m_webView->ExecuteScript(dialog.input.c_str(),
            Callback<ICoreWebView2ExecuteScriptCompletedHandler>(
                [](HRESULT error, PCWSTR result) -> HRESULT
        {
            if (error != S_OK) {
                ShowFailure(error, L"ExecuteScript failed");
            }
            MessageBox(nullptr, result, L"ExecuteScript Result", MB_OK);
            return S_OK;
        }).Get());
    }
}

get_BrowserProcessId

The process ID of the browser process that hosts the WebView.

public HRESULT get_BrowserProcessId(UINT32 * value)

get_CanGoBack

TRUE if the WebView is able to navigate to a previous page in the navigation history.

public HRESULT get_CanGoBack(BOOL * canGoBack)

If CanGoBack changes value, the HistoryChanged event runs.

get_CanGoForward

TRUE if the WebView is able to navigate to a next page in the navigation history.

public HRESULT get_CanGoForward(BOOL * canGoForward)

If CanGoForward changes value, the HistoryChanged event runs.

get_ContainsFullScreenElement

Indicates if the WebView contains a fullscreen HTML element.

public HRESULT get_ContainsFullScreenElement(BOOL * containsFullScreenElement)

get_DocumentTitle

The title for the current top-level document.

public HRESULT get_DocumentTitle(LPWSTR * title)

If the document has no explicit title or is otherwise empty, a default that may or may not match the URI of the document is used.

get_Settings

The ICoreWebView2Settings object contains various modifiable settings for the running WebView.

public HRESULT get_Settings(ICoreWebView2Settings ** settings)

get_Source

The URI of the current top level document.

public HRESULT get_Source(LPWSTR * uri)

This value potentially changes as a part of the SourceChanged event that runs for some cases such as navigating to a different site or fragment navigations. It remains the same for other types of navigations such as page refreshes or history.pushState with the same URL as the current page.

    // Register a handler for the SourceChanged event.
    // This handler will read the webview's source URI and update
    // the app's address bar.
    CHECK_FAILURE(m_webView->add_SourceChanged(
        Callback<ICoreWebView2SourceChangedEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2SourceChangedEventArgs* args)
                -> HRESULT {
                wil::unique_cotaskmem_string uri;
                sender->get_Source(&uri);
                if (wcscmp(uri.get(), L"about:blank") == 0)
                {
                    uri = wil::make_cotaskmem_string(L"");
                }
                SetWindowText(GetAddressBar(), uri.get());

                return S_OK;
            })
            .Get(),
        &m_sourceChangedToken));

GetDevToolsProtocolEventReceiver

Get a DevTools Protocol event receiver that allows you to subscribe to a DevTools Protocol event.

public HRESULT GetDevToolsProtocolEventReceiver(LPCWSTR eventName, ICoreWebView2DevToolsProtocolEventReceiver ** receiver)

The eventName parameter is the full name of the event in the format {domain}.{event}. For more information about DevTools Protocol events description and event args, navigate to DevTools Protocol Viewer.

// Prompt the user to name a CDP event, and then subscribe to that event.
void ScriptComponent::SubscribeToCdpEvent()
{
    TextInputDialog dialog(
        m_appWindow->GetMainWindow(),
        L"Subscribe to CDP Event",
        L"CDP event name:",
        L"Enter the name of the CDP event to subscribe to.\r\n"
            L"You may also have to call the \"enable\" method of the\r\n"
            L"event's domain to receive events (for example \"Log.enable\").\r\n",
        L"Log.entryAdded");
    if (dialog.confirmed)
    {
        std::wstring eventName = dialog.input;
        wil::com_ptr<ICoreWebView2DevToolsProtocolEventReceiver> receiver;
        CHECK_FAILURE(
            m_webView->GetDevToolsProtocolEventReceiver(eventName.c_str(), &receiver));

        // If we are already subscribed to this event, unsubscribe first.
        auto preexistingToken = m_devToolsProtocolEventReceivedTokenMap.find(eventName);
        if (preexistingToken != m_devToolsProtocolEventReceivedTokenMap.end())
        {
            CHECK_FAILURE(receiver->remove_DevToolsProtocolEventReceived(
                preexistingToken->second));
        }

        CHECK_FAILURE(receiver->add_DevToolsProtocolEventReceived(
            Callback<ICoreWebView2DevToolsProtocolEventReceivedEventHandler>(
                [eventName](
                    ICoreWebView2* sender,
                    ICoreWebView2DevToolsProtocolEventReceivedEventArgs* args) -> HRESULT {
                    wil::unique_cotaskmem_string parameterObjectAsJson;
                    CHECK_FAILURE(args->get_ParameterObjectAsJson(&parameterObjectAsJson));
                    MessageBox(
                        nullptr, parameterObjectAsJson.get(),
                        (L"CDP Event Fired: " + eventName).c_str(), MB_OK);
                    return S_OK;
                })
                .Get(),
            &m_devToolsProtocolEventReceivedTokenMap[eventName]));
    }
}

GoBack

Navigates the WebView to the previous page in the navigation history.

public HRESULT GoBack()

GoForward

Navigates the WebView to the next page in the navigation history.

public HRESULT GoForward()

Cause a navigation of the top-level document to run to the specified URI.

public HRESULT Navigate(LPCWSTR uri)

For more information, navigate to Navigation events.

Note

This operation starts a navigation and the corresponding NavigationStarting event triggers sometime after Navigate runs.

void ControlComponent::NavigateToAddressBar()
{
    int length = GetWindowTextLength(GetAddressBar());
    std::wstring uri(length, 0);
    PWSTR buffer = const_cast<PWSTR>(uri.data());
    GetWindowText(GetAddressBar(), buffer, length + 1);

    HRESULT hr = m_webView->Navigate(uri.c_str());
    if (hr == E_INVALIDARG)
    {
        // An invalid URI was provided.
        if (uri.find(L' ') == std::wstring::npos
            && uri.find(L'.') != std::wstring::npos)
        {
            // If it contains a dot and no spaces, try tacking http:// on the front.
            hr = m_webView->Navigate((L"http://" + uri).c_str());
        }
        else
        {
            // Otherwise treat it as a web search. We aren't bothering to escape
            // URL syntax characters such as & and #
            hr = m_webView->Navigate((L"https://bing.com/search?q=" + uri).c_str());
        }
    }
    if (hr != E_INVALIDARG) {
        CHECK_FAILURE(hr);
    }
}

Initiates a navigation to htmlContent as source HTML of a new document.

public HRESULT NavigateToString(LPCWSTR htmlContent)

The htmlContent parameter may not be larger than 2 MB in total size. The origin of the new page is about:blank.

                    static const PCWSTR htmlContent =
                        L"<h1>Domain Blocked</h1>"
                        L"<p>You've attempted to navigate to a domain in the blocked "
                        L"sites list. Press back to return to the previous page.</p>";
                    CHECK_FAILURE(sender->NavigateToString(htmlContent));

OpenDevToolsWindow

Opens the DevTools window for the current document in the WebView.

public HRESULT OpenDevToolsWindow()

Does nothing if run when the DevTools window is already open.

PostWebMessageAsJson

Post the specified webMessage to the top level document in this WebView.

public HRESULT PostWebMessageAsJson(LPCWSTR webMessageAsJson)

Runs the message event of the window.chrome.webview of the top-level document. JavaScript in that document may subscribe and unsubscribe to the event using the following code.

window.chrome.webview.addEventListener('message', handler)
window.chrome.webview.removeEventListener('message', handler)

The event args is an instance of MessageEvent. The ICoreWebView2Settings::IsWebMessageEnabled setting must be TRUE or this method fails with E_INVALIDARG. The data property of the event arg is the webMessage string parameter parsed as a JSON string into a JavaScript object. The source property of the event arg is a reference to the window.chrome.webview object. For information about sending messages from the HTML document in the WebView to the host, navigate to [add_WebMessageReceived]. The message is sent asynchronously. If a navigation occurs before the message is posted to the page, the message is not sent.

    // Setup the web message received event handler before navigating to
    // ensure we don't miss any messages.
    CHECK_FAILURE(m_webView->add_WebMessageReceived(
        Microsoft::WRL::Callback<ICoreWebView2WebMessageReceivedEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2WebMessageReceivedEventArgs* args)
    {
        wil::unique_cotaskmem_string uri;
        CHECK_FAILURE(args->get_Source(&uri));

        // Always validate that the origin of the message is what you expect.
        if (uri.get() != m_sampleUri)
        {
            return S_OK;
        }
        wil::unique_cotaskmem_string messageRaw;
        CHECK_FAILURE(args->TryGetWebMessageAsString(&messageRaw));
        std::wstring message = messageRaw.get();

        if (message.compare(0, 13, L"SetTitleText ") == 0)
        {
            m_appWindow->SetTitleText(message.substr(13).c_str());
        }
        else if (message.compare(L"GetWindowBounds") == 0)
        {
            RECT bounds = m_appWindow->GetWindowBounds();
            std::wstring reply =
                L"{\"WindowBounds\":\"Left:" + std::to_wstring(bounds.left)
                + L"\\nTop:" + std::to_wstring(bounds.top)
                + L"\\nRight:" + std::to_wstring(bounds.right)
                + L"\\nBottom:" + std::to_wstring(bounds.bottom)
                + L"\"}";
            CHECK_FAILURE(sender->PostWebMessageAsJson(reply.c_str()));
        }
        return S_OK;
    }).Get(), &m_webMessageReceivedToken));

PostWebMessageAsString

Posts a message that is a simple string rather than a JSON string representation of a JavaScript object.

public HRESULT PostWebMessageAsString(LPCWSTR webMessageAsString)

This behaves in exactly the same manner as PostWebMessageAsJson, but the data property of the event arg of the window.chrome.webview message is a string with the same value as webMessageAsString. Use this instead of PostWebMessageAsJson if you want to communicate using simple strings rather than JSON objects.

Reload

Reload the current page.

public HRESULT Reload()

This is similar to navigating to the URI of current top level document including all navigation events firing and respecting any entries in the HTTP cache. But, the back or forward history are not modified.

remove_ContainsFullScreenElementChanged

Remove an event handler previously added with add_ContainsFullScreenElementChanged.

public HRESULT remove_ContainsFullScreenElementChanged(EventRegistrationToken token)

remove_ContentLoading

Remove an event handler previously added with add_ContentLoading.

public HRESULT remove_ContentLoading(EventRegistrationToken token)

remove_DocumentTitleChanged

Remove an event handler previously added with add_DocumentTitleChanged.

public HRESULT remove_DocumentTitleChanged(EventRegistrationToken token)

remove_FrameNavigationCompleted

Remove an event handler previously added with add_FrameNavigationCompleted.

public HRESULT remove_FrameNavigationCompleted(EventRegistrationToken token)

remove_FrameNavigationStarting

Remove an event handler previously added with add_FrameNavigationStarting.

public HRESULT remove_FrameNavigationStarting(EventRegistrationToken token)

remove_HistoryChanged

Remove an event handler previously added with add_HistoryChanged.

public HRESULT remove_HistoryChanged(EventRegistrationToken token)

remove_NavigationCompleted

Remove an event handler previously added with add_NavigationCompleted.

public HRESULT remove_NavigationCompleted(EventRegistrationToken token)

remove_NavigationStarting

Remove an event handler previously added with add_NavigationStarting.

public HRESULT remove_NavigationStarting(EventRegistrationToken token)

remove_NewWindowRequested

Remove an event handler previously added with add_NewWindowRequested.

public HRESULT remove_NewWindowRequested(EventRegistrationToken token)

remove_PermissionRequested

Remove an event handler previously added with add_PermissionRequested.

public HRESULT remove_PermissionRequested(EventRegistrationToken token)

remove_ProcessFailed

Remove an event handler previously added with add_ProcessFailed.

public HRESULT remove_ProcessFailed(EventRegistrationToken token)

remove_ScriptDialogOpening

Remove an event handler previously added with add_ScriptDialogOpening.

public HRESULT remove_ScriptDialogOpening(EventRegistrationToken token)

remove_SourceChanged

Remove an event handler previously added with add_SourceChanged.

public HRESULT remove_SourceChanged(EventRegistrationToken token)

remove_WebMessageReceived

Remove an event handler previously added with add_WebMessageReceived.

public HRESULT remove_WebMessageReceived(EventRegistrationToken token)

remove_WebResourceRequested

Remove an event handler previously added with add_WebResourceRequested.

public HRESULT remove_WebResourceRequested(EventRegistrationToken token)

remove_WindowCloseRequested

Remove an event handler previously added with add_WindowCloseRequested.

public HRESULT remove_WindowCloseRequested(EventRegistrationToken token)

RemoveHostObjectFromScript

Remove the host object specified by the name so that it is no longer accessible from JavaScript code in the WebView.

public HRESULT RemoveHostObjectFromScript(LPCWSTR name)

While new access attempts are denied, if the object is already obtained by JavaScript code in the WebView, the JavaScript code continues to have access to that object. Run this method for a name that is already removed or never added fails.

RemoveScriptToExecuteOnDocumentCreated

Remove the corresponding JavaScript added using AddScriptToExecuteOnDocumentCreated with the specified script ID.

public HRESULT RemoveScriptToExecuteOnDocumentCreated(LPCWSTR id)

RemoveWebResourceRequestedFilter

Removes a matching WebResource filter that was previously added for the WebResourceRequested event.

public HRESULT RemoveWebResourceRequestedFilter(LPCWSTR const uri, COREWEBVIEW2_WEB_RESOURCE_CONTEXT const resourceContext)

If the same filter was added multiple times, then it must be removed as many times as it was added for the removal to be effective. Returns E_INVALIDARG for a filter that was never added.

Stop

Stop all navigations and pending resource fetches. Does not stop scripts.

public HRESULT Stop()

COREWEBVIEW2_CAPTURE_PREVIEW_IMAGE_FORMAT

Specifies the image format for the ICoreWebView2::CapturePreview method.

enum COREWEBVIEW2_CAPTURE_PREVIEW_IMAGE_FORMAT

Values Descriptions
COREWEBVIEW2_CAPTURE_PREVIEW_IMAGE_FORMAT_PNG Indicates that the PNG image format is used.
COREWEBVIEW2_CAPTURE_PREVIEW_IMAGE_FORMAT_JPEG Indicates the JPEG image format is used.

Kind of cookie SameSite status used in the ICoreWebView2Cookie interface.

enum COREWEBVIEW2_COOKIE_SAME_SITE_KIND

Values Descriptions
COREWEBVIEW2_COOKIE_SAME_SITE_KIND_NONE None SameSite type. No restrictions on cross-site requests.
COREWEBVIEW2_COOKIE_SAME_SITE_KIND_LAX Lax SameSite type. The cookie will be sent with "same-site" requests, and with "cross-site" top level navigation.
COREWEBVIEW2_COOKIE_SAME_SITE_KIND_STRICT Strict SameSite type. The cookie will only be sent along with "same-site" requests.

These fields match those as specified in https://developer.mozilla.org/docs/Web/HTTP/Cookies#. Learn more about SameSite cookies here: https://tools.ietf.org/html/draft-west-first-party-cookies-07

COREWEBVIEW2_KEY_EVENT_KIND

Specifies the key event type that triggered an AcceleratorKeyPressed event.

enum COREWEBVIEW2_KEY_EVENT_KIND

Values Descriptions
COREWEBVIEW2_KEY_EVENT_KIND_KEY_DOWN Specifies that the key event type corresponds to window message WM_KEYDOWN.
COREWEBVIEW2_KEY_EVENT_KIND_KEY_UP Specifies that the key event type corresponds to window message WM_KEYUP.
COREWEBVIEW2_KEY_EVENT_KIND_SYSTEM_KEY_DOWN Specifies that the key event type corresponds to window message WM_SYSKEYDOWN.
COREWEBVIEW2_KEY_EVENT_KIND_SYSTEM_KEY_UP Specifies that the key event type corresponds to window message WM_SYSKEYUP.

COREWEBVIEW2_MOVE_FOCUS_REASON

Specifies the reason for moving focus.

enum COREWEBVIEW2_MOVE_FOCUS_REASON

Values Descriptions
COREWEBVIEW2_MOVE_FOCUS_REASON_PROGRAMMATIC Specifies that the code is setting focus into WebView.
COREWEBVIEW2_MOVE_FOCUS_REASON_NEXT Specifies that the focus is moving due to Tab traversal forward.
COREWEBVIEW2_MOVE_FOCUS_REASON_PREVIOUS Specifies that the focus is moving due to Tab traversal backward.

COREWEBVIEW2_PERMISSION_KIND

Indicates the type of a permission request.

enum COREWEBVIEW2_PERMISSION_KIND

Values Descriptions
COREWEBVIEW2_PERMISSION_KIND_UNKNOWN_PERMISSION Indicates an unknown permission.
COREWEBVIEW2_PERMISSION_KIND_MICROPHONE Indicates permission to capture audio.
COREWEBVIEW2_PERMISSION_KIND_CAMERA Indicates permission to capture video.
COREWEBVIEW2_PERMISSION_KIND_GEOLOCATION Indicates permission to access geolocation.
COREWEBVIEW2_PERMISSION_KIND_NOTIFICATIONS Indicates permission to send web notifications. This permission request is currently auto-rejected and no event is run for it.
COREWEBVIEW2_PERMISSION_KIND_OTHER_SENSORS Indicates permission to access generic sensor. Generic Sensor covering ambient-light-sensor, accelerometer, gyroscope, and magnetometer.
COREWEBVIEW2_PERMISSION_KIND_CLIPBOARD_READ Indicates permission to read the system clipboard without a user gesture.

COREWEBVIEW2_PERMISSION_STATE

Specifies the response to a permission request.

enum COREWEBVIEW2_PERMISSION_STATE

Values Descriptions
COREWEBVIEW2_PERMISSION_STATE_DEFAULT Specifies that the default browser behavior is used, which normally prompt users for decision.
COREWEBVIEW2_PERMISSION_STATE_ALLOW Specifies that the permission request is granted.
COREWEBVIEW2_PERMISSION_STATE_DENY Specifies that the permission request is denied.

COREWEBVIEW2_PHYSICAL_KEY_STATUS

Contains the information packed into the LPARAM sent to a Win32 key event.

typedef COREWEBVIEW2_PHYSICAL_KEY_STATUS

For more information about WM_KEYDOWN, navigate to WM_KEYDOWN message.

COREWEBVIEW2_PROCESS_FAILED_KIND

Specifies the process failure type used in the ICoreWebView2ProcessFailedEventHandler interface.

enum COREWEBVIEW2_PROCESS_FAILED_KIND

Values Descriptions
COREWEBVIEW2_PROCESS_FAILED_KIND_BROWSER_PROCESS_EXITED Indicates that the browser process ended unexpectedly. The WebView automatically moves to the Closed state. The app has to recreate a new WebView to recover from this failure.
COREWEBVIEW2_PROCESS_FAILED_KIND_RENDER_PROCESS_EXITED Indicates that the render process ended unexpectedly. A new render process is created automatically and navigated to an error page. The app runs Reload to try to recover from the failure.
COREWEBVIEW2_PROCESS_FAILED_KIND_RENDER_PROCESS_UNRESPONSIVE Indicates that the render process is unresponsive.

COREWEBVIEW2_SCRIPT_DIALOG_KIND

Specifies the JavaScript dialog type used in the ICoreWebView2ScriptDialogOpeningEventHandler interface.

enum COREWEBVIEW2_SCRIPT_DIALOG_KIND

Values Descriptions
COREWEBVIEW2_SCRIPT_DIALOG_KIND_ALERT Indicates that the dialog uses the window.alert JavaScript function.
COREWEBVIEW2_SCRIPT_DIALOG_KIND_CONFIRM Indicates that the dialog uses the window.confirm JavaScript function.
COREWEBVIEW2_SCRIPT_DIALOG_KIND_PROMPT Indicates that the dialog uses the window.prompt JavaScript function.
COREWEBVIEW2_SCRIPT_DIALOG_KIND_BEFOREUNLOAD Indicates that the dialog uses the beforeunload JavaScript event.

COREWEBVIEW2_WEB_ERROR_STATUS

Indicates the error status values for web navigations.

enum COREWEBVIEW2_WEB_ERROR_STATUS

Values Descriptions
COREWEBVIEW2_WEB_ERROR_STATUS_UNKNOWN Indicates that an unknown error occurred.
COREWEBVIEW2_WEB_ERROR_STATUS_CERTIFICATE_COMMON_NAME_IS_INCORRECT Indicates that the SSL certificate common name does not match the web address.
COREWEBVIEW2_WEB_ERROR_STATUS_CERTIFICATE_EXPIRED Indicates that the SSL certificate has expired.
COREWEBVIEW2_WEB_ERROR_STATUS_CLIENT_CERTIFICATE_CONTAINS_ERRORS Indicates that the SSL client certificate contains errors.
COREWEBVIEW2_WEB_ERROR_STATUS_CERTIFICATE_REVOKED Indicates that the SSL certificate has been revoked.
COREWEBVIEW2_WEB_ERROR_STATUS_CERTIFICATE_IS_INVALID Indicates that the SSL certificate is not valid. The certificate may not match the public key pins for the host name, the certificate is signed by an untrusted authority or using a weak sign algorithm, the certificate claimed DNS names violate name constraints, the certificate contains a weak key, the validity period of the certificate is too long, lack of revocation information or revocation mechanism, non-unique host name, lack of certificate transparency information, or the certificate is chained to a legacy Symantec root.
COREWEBVIEW2_WEB_ERROR_STATUS_SERVER_UNREACHABLE Indicates that the host is unreachable.
COREWEBVIEW2_WEB_ERROR_STATUS_TIMEOUT Indicates that the connection has timed out.
COREWEBVIEW2_WEB_ERROR_STATUS_ERROR_HTTP_INVALID_SERVER_RESPONSE Indicates that the server returned an invalid or unrecognized response.
COREWEBVIEW2_WEB_ERROR_STATUS_CONNECTION_ABORTED Indicates that the connection was stopped.
COREWEBVIEW2_WEB_ERROR_STATUS_CONNECTION_RESET Indicates that the connection was reset.
COREWEBVIEW2_WEB_ERROR_STATUS_DISCONNECTED Indicates that the Internet connection has been lost.
COREWEBVIEW2_WEB_ERROR_STATUS_CANNOT_CONNECT Indicates that a connection to the destination was not established.
COREWEBVIEW2_WEB_ERROR_STATUS_HOST_NAME_NOT_RESOLVED Indicates that the provided host name was not able to be resolved.
COREWEBVIEW2_WEB_ERROR_STATUS_OPERATION_CANCELED Indicates that the operation was canceled.
COREWEBVIEW2_WEB_ERROR_STATUS_REDIRECT_FAILED Indicates that the request redirect failed.
COREWEBVIEW2_WEB_ERROR_STATUS_UNEXPECTED_ERROR Indicates that an unexpected error occurred.

COREWEBVIEW2_WEB_RESOURCE_CONTEXT

Specifies the web resource request contexts.

enum COREWEBVIEW2_WEB_RESOURCE_CONTEXT

Values Descriptions
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_ALL Specifies all resources.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_DOCUMENT Specifies a document resource.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_STYLESHEET Specifies a CSS resource.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_IMAGE Specifies an image resource.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_MEDIA Specifies another media resource such as a video.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_FONT Specifies a font resource.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_SCRIPT Specifies a script resource.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_XML_HTTP_REQUEST Specifies an XML HTTP request.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_FETCH Specifies a Fetch API communication.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_TEXT_TRACK Specifies a TextTrack resource.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_EVENT_SOURCE Specifies an EventSource API communication.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_WEBSOCKET Specifies a WebSocket API communication.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_MANIFEST Specifies a Web App Manifest.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_SIGNED_EXCHANGE Specifies a Signed HTTP Exchange.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_PING Specifies a Ping request.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_CSP_VIOLATION_REPORT Specifies a CSP Violation Report.
COREWEBVIEW2_WEB_RESOURCE_CONTEXT_OTHER Specifies an other resource.