Allows developers to selectively enable and disable the use of media elements (<img> and <video>) without specified dimensions through the Feature-Policy HTTP header or the <iframe> 'allow' attribute. This provides more control over media elements with unspecified dimension, on a per-origin basis. Use this policy to improve layout stability. The identifier for the feature in policies is 'unsized-media'. By default, 'unsized-media' is allowed in all frames.

Demo

• https://feature-policy-demos.appspot.com/unsized-media.html?on

Documentation

• https://github.com/WICG/feature-policy/blob/master/policies/unsized-media.md

Status in Chromium

Blink components: Blink>FeaturePolicy

In developer trial (Behind a flag) (tracking bug) in:

• Chrome for desktop release 66

Consensus & Standardization

• Firefox: No signal
• Edge: No signal
• Safari: No signal
• Web Developers: No signals

Owner

• loonybear@chromium.org

Last updated on 2020-11-09