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In the text added in rev 4803, the step "Set node to the previous entry in the stack of open elements." walks past the start of the stack when node is the root node.
Adjusting importance per discussion with Hixie.
http://hg.mozilla.org/mozilla-central/file/62c09fac599a/parser/html/javasrc/TreeBuilder.java#l3109 shows how I improvised around this bug.
http://hg.mozilla.org/projects/htmlparser/rev/b08b9993cd5d#l1.66 (three lines) is the fix for this bug.
*** Bug 10118 has been marked as a duplicate of this bug. ***
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Accepted Change Description: see diff given below Rationale: Concurred with reporter's comments. I don't think I've fixed this the way you did, but I'm not sure because I couldn't follow your code easily from a quick glance.
Checked in as WHATWG revision r5155. Check-in comment: Foreign content end tag handling change. http://html5.org/tools/web-apps-tracker?from=5154&to=5155