https://registry.khronos.org/webgl/extensions/WEBGL_clip_cull_distance/
It should be pointed out that Alexey already implemented this extension in ANGLE, so once WebKit rolls forward ANGLE, exposing it to WebGL should be easy.
Committed 259435@main (c2b37c11144b): <https://commits.webkit.org/259435@main> Reviewed commits have been landed. Closing PR #9172 and removing active labels.
<rdar://problem/104701176>