Hi,

As of today I intend to turn this feature on for release and beta channels (it was enabled only on Nightly until now).

It's been developed behind the layout.css.width-and-height-map-to-aspect-ratio.enabled pref.

Bug to turn on by default: https://bugzilla.mozilla.org/show_bug.cgi?id=1585637

This was implemented in bug 1547231.

Spec link is https://html.spec.whatwg.org/multipage/rendering.html#attributes-for-embedded-content-and-images (spec PR: https://github.com/whatwg/html/pull/4952).

Platform coverage: All

web-platform-tests: https://github.com/web-platform-tests/wpt/blob/abb820ae83ffb82ccd8380ce61685b51329a7b07/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/img-aspect-ratio.tentative.html (which I guess I should rename now that there's a spec).

Relevant browser bugs:

    Chrome: https://bugs.chromium.org/p/chromium/issues/detail?id=979891
    Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1547231
    Safari: https://bugs.webkit.org/show_bug.cgi?id=201641

Secure contexts: not restricted to secure contexts, as many layout features.

Is this feature enabled by default in sandboxed iframes? Yes

Let me know if there's any concern with this.

Thanks,

 -- Emilio
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