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[css-view-transitions-1] Don't animate transform/size by default when prefers-reduced-motion is on #10996

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@noamr noamr commented Oct 3, 2024

Closes #10267

@@ -1538,6 +1538,14 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
backdrop-filter: <var>backdropFilter</var>;
}
}

@media (prefers-reduced-motion) {
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The thinking here was to reset the animation property on the group pseudo instead of modifying the keyframe. So if the author does want to reinstate the size/position animation they'll have access to the keyframe. But I didn't realize that other properties are part of this keyframe too.

And actually more will be added with the new capture mode.

@@ -1538,6 +1538,14 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
backdrop-filter: <var>backdropFilter</var>;
}
}

@media (prefers-reduced-motion) {
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Is there a WPT test for this? Asking b/c I don't know offhand if the user preference media features can be tested in WPT. If not, merging this PR may be dependent on that test-ability requirement.

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It's not currently testable. See web-platform-tests/wpt#14839

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[css-view-transitions] Users need to be able to disable view transitions
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