[Webkit-unassigned] [Bug 211505] REGRESSION (r253875?): Element styles incorrect after media query evaluation changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211505

--- Comment #4 from james.brooks at starlingbank.com ---
I've attached a minimal reproduction similar to the video above - let me know if you need something more specific.

I also spent a bit more time looking into the cause and it seems like the inclusion of a @keyframes rule inside of the media query is at fault in this example. This was a mistake on my part and moving the rule outside of the media query appears to result in the expected behaviour.

I do still think there's a regression here though - in the first instance the @keyframes rule was in a different media query to the one where I had noticed the issue so it seems that this was causing issues with invalidating styles across the tree rather than just the query containing the @keyframes rule? And as I mentioned in the original report, this doesn't appear to have been an issue prior to Safari 13.1.

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