WebKit has some unique failures for css/css-animations/KeyframeEffect-getKeyframes.tentative.html. See https://wpt.fyi/results/css/css-animations/KeyframeEffect-getKeyframes.tentative.html?label=experimental&label=master&aligned.
<rdar://problem/87785529>
I filed https://github.com/web-platform-tests/wpt/issues/32616 to understand why the test expects specified value for the serialization but the spec discusses computed values.
The last failure will be fixed once bug 23924 is fixed.
No, the real fix for the last failure will happen to be the one for bug 235808.
This got fixed with 255038@main.