Automatic update from web-platform-tests [Fullscreen] Implement iframe fullscreen flag Wire up the spec's iframe fullscreen flag so that "collect documents to unfullscreen" stops at an iframe that itself was the fullscreen target, instead of unconditionally walking to its parent document. Bug: 41257216 Change-Id: If6bb12cabfa24b670fcd722a57990acb4b40c867 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7966544 Reviewed-by: Philip Jägenstedt <foolip@chromium.org> Commit-Queue: Pryor <pryor@chromium.org> Cr-Commit-Position: refs/heads/main@{#1659317} -- wpt-commits: ec7065aa57fb3bc3054e9f88f3c2a454672174a9 wpt-pr: 61150