If Flash is used on your page but the user has not enabled it, Microsoft Edge will normally show a puzzle piece icon in the address bar. If you are dynamically adding the Flash control after the page is loaded, the puzzle icon may not display, in which case you'll want to test if Flash is loaded and provide a graceful fallback experience if its not present.
Microsoft Edge provides a reading view for a more streamlined, book-like reading experience of webpages, without the distraction of unrelated or other secondary content on the page. Here are tips on how to ensure a great reading view experience with your site and also instructions for opting your site out of reading view.
Search provider discovery
Rich search integration is built into the Microsoft Edge address bar, including search suggestions, results from the web, your browsing history, and favorites. Here's more info for search providers looking to provide support for Microsoft Edge.