Hi Team, While going through Chrome Monorail, I came across following w3c test suite in relation to MutationObserver, which Safari 16 and STP 153 fails: Link - http://w3c-test.org/dom/nodes/MutationObserver-document.html Chrome Commit - https://chromium.googlesource.com/chromium/src.git/+/5a3def7f350a35e7e481714f0d3851c9434cdeec ______ Safari is failing following two test cases: > parser script insertion mutation > removal of parent during parsing ______ These are also failed by Firefox Nightly 107 while only Chrome Canary 108 pass them. I was not able to find related bug, so I thought to great so we can track and if they are not needed then we can document our rationale at least. Thanks!