TestOptions::enableUndoManagerAPI can be removed because using "internal:UndoManagerAPIEnabled" will just work: -<!DOCTYPE html> <!-- webkit-test-runner [ enableUndoManagerAPI=true ] --> +<!DOCTYPE html> <!-- webkit-test-runner [ internal:UndoManagerAPIEnabled=true ] -->
Created attachment 395120 [details] Patch v1
Comment on attachment 395120 [details] Patch v1 Hmmm, I may have underestimated what the fix in Bug 209678 does. Testing locally, this actually doesn't work by itself. I cleared the review flag for now.
Welp, it turns out this depends on changes in Bug 209678, so duping to that. *** This bug has been marked as a duplicate of bug 209678 ***