If there are multiple prefixed/non-prefixed @keyframes with the same name;
* non-prefixed rule overrides earlier rules.
* prefixed rule overrides earlier prefixed rules.
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This is PR of https://bugzilla.mozilla.org/show_bug.cgi?id=1356779
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Before this PR, every object reflected in CSSOM is in `Arc<RwLock<_>>` to enable safe (synchronized) mutable aliasing. Acquiring all these locks has significant cost during selector matching:
* https://bugzilla.mozilla.org/show_bug.cgi?id=1311469
* https://bugzilla.mozilla.org/show_bug.cgi?id=1335941
* https://bugzilla.mozilla.org/show_bug.cgi?id=1339703
This PR introduce a mechanism to protect many objects with the same `RwLock` that only needs to be acquired once.
In Stylo, there is one such lock per process (in a `lazy_static`), used for everything.
I non-Stylo Servo, I originally intended to have one such lock per document (for author-origin stylesheets, and one per process for user-agent and user sytlesheets since they’re shared across documents, and never mutated anyway). However I failed to have the same document-specific (or pipeline-specific) `Arc` reachable from both `Document` nodes and `LayoutThread`. Recursively following callers lead me to include this `Arc` in `UnprivilegedPipelineContent`, but that needs to be serializable. So there is a second process-wide lock.
This was previously #15998, closed accidentally.
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This is a PR of https://bugzilla.mozilla.org/show_bug.cgi?id=1340961
All patches has been reviewed by @emilio.
Thanks!
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We should create KeyframeAnimation even if css keyframe rule is empty because we should fire css animation events for such CSS animations.
Also we should ignore properties that are annotated with '!important'. From the spec[1].
using !important on them is invalid and will cause the property to be ignored
[1] https://drafts.csswg.org/css-animations-1/#keyframes
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