When parsing a full doc from a string, nsHtml5TreeOpExecutor unblocks onload an extra time and causes an assertion. Layout start and scroll to ref code unnecessary, too.
Created attachment 591715 [details] [diff] [review] Return earlier from DidBuildModel when working for an nsHtml5StringParser We didn't have enough DOMParser reftest/crashtest coverage to catch the assertion earlier.
Thanks for the r+. https://hg.mozilla.org/integration/mozilla-inbound/rev/39b235bc0ac4