Upgrade libssl dependency on Debian
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The openssl-sys-extras crate used by Servo uses the outdated version
1.0 of libssl, and this exists as the libssl1.0-dev on Debian ever since
Debian upgraded to libssl 1.1.
See https://github.com/sfackler/rust-openssl/issues/522 for more context.
update mouse position when receiving mouse wheel events
Rebase of #14808.
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A test case change is added to #13442: Fix #12193 Servo displays upper level Thai character in wrong place.
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Create KeyframeAnimation for empty keyframe rules
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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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We need to create CSS animations that have empty keyframe or keyframes
which have only invalid properties or non-animatable properties to fire
animation events for such animations.
