Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
legacy-image-formats directive controls whether the current document is allowed to display images in legacy formats.
Feature-Policy: legacy-image-formats <allowlist>;
A list of origins for which the feature is allowed. See
Default allow list for
BCD tables only load in the browser