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This policy controls the ability of the document to render images in legacy image formats. These are defined as any format other than JPEG, PNG, GIF, WEBP, or SVG. In documents in which this policy is disallowed, legacy-format images will be rendered with inverted colours.
How to apply this policy
Send the following HTTP header to control the
and disallow it on all origins:
Feature-Policy: legacy-image-formats 'none'
Affected use case example
<img src='/test-assets/small-image.bmp' width="150" height="150" />
Does it work?
Currently Firefox, and Chromium based browsers, such as Google Chrome, Samsung Internet,
and Opera, are the only user-agents to support Feature Policy. The minimum version that
correctly recognises the
legacy-image-formats policy is: