Reanimated's web path saves a custom keyframe's element rect when the
animation ends, and writes it back as inline top/left/width/height when
it cleans the keyframe up 750ms after the start. A menu whose content
resized in between, such as a plugin popover whose data had just
arrived, was left clipped to its loading-state size or hanging over its
anchor.
Play the same keyframes through the Web Animations API on web, which
leaves no inline style, and drop the height release that only undid
part of that write. Native keeps the Reanimated Keyframe.
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