: The feature is allowed in specific origin(s), for example.'none': The feature is not allowed at all in top-level and nested browsing contexts.The feature is not allowed in cross-origin documents for nested browsing contexts. 'self': the feature is allowed in top-level browsing contexts and same-origin nested contexts.*: used above, the feature is allowed in top-level browsing contexts and in nested contexts (iframes).To tighten things up you can be more granular about which domains have access to those features as the allow_list can have any of the following values: The above will allow any page, hosted on any domain to request access to the camera and microphone of the user while loaded through the above iframe. Thus, to allow camera and microphone access in a cross origin iframe you need to add the following allow attribute to your iframe: You can specify allow lists for more than one feature by using semicolons: The syntax is quite simple, it has the following form: The allow attribute of the iframe HTML element enables you to control the sensitive features available within that iframe. You can check Chrome's source for an up to date list of features that are under Feature Policy control or for a list of policies that are considered for implementation.īelow, we will be focusing on the allow attribute in iframes as it relates to camera and microphone access through getUserMedia(), for a more detailed overview of Feature Policy check out this excellent introduction article. accessing the accelerometer or USB devices.accessing the camera and microphone through getUserMedia().You can control whether or not these features are available through the Feature-Policy HTTP header OR by using the allow attribute in HTML iframes. Chrome 64 blocked camera and microphone access in cross origin iframes by default and required Feature Policy to grant accessįeature Policy allows you to control what sensitive APIs and features are available to the website in the browser.
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