2.2.16 [HTML5:2014] Section 4.7.3 The embed element
C0022: The user is not provided an option to override the sandbox and instantiate the plugin anyway
The specification states:
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... The embed element ... ... The user agent may offer the user the option to override the sandbox and instantiate the plugin anyway; if the user invokes such an option, the user agent must act as if the conditions above did not apply for the purposes of this element.
All document modes (All versions)
The user is not provided an option to override the sandbox and instantiate the plugin anyway.