According to the WebVTT specification, percentage values must be in the range of 0 to 100, and negative percentages are not valid. https://www.w3.org/TR/webvtt1/#webvtt-percentage The following WPTs are failing due to this issue: https://wpt.fyi/results/webvtt/parsing/file-parsing/tests/regions-regionanchor.html?label=experimental&label=master&aligned https://wpt.fyi/results/webvtt/parsing/file-parsing/tests/regions-viewportanchor.html?label=experimental&label=master&aligned
Pull request: https://github.com/WebKit/WebKit/pull/19527
Committed 269882@main (6c997a688fcd): <https://commits.webkit.org/269882@main> Reviewed commits have been landed. Closing PR #19527 and removing active labels.
<rdar://problem/117615681>