Remove the white background from fullscreen https://searchfox.org/wubkat/source/Source/WebCore/css/fullscreen.css#45 WebKit https://searchfox.org/wubkat/source/Source/WebCore/css/fullscreen.css#45 Blink https://chromium.googlesource.com/chromium/blink/+/refs/heads/main/Source/core/css/fullscreen.css#2 Gecko https://searchfox.org/mozilla-central/source/layout/style/res/ua.css#344 There was a fake backdrop put in place https://github.com/WebKit/WebKit/pull/6021/files which would be better to use.
<rdar://problem/102653160>
Pull request: https://github.com/WebKit/WebKit/pull/6793
Committed 257271@main (6525018e7c18): <https://commits.webkit.org/257271@main> Reviewed commits have been landed. Closing PR #6793 and removing active labels.