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The document "<!DOCTYPE><html><frameset></frameset></html></frameset>" results in the HTML element being the current element in the "in frameset" insertion mode even though this is not "(fragment case)", which is contrary to what the spec says. After the first </frameset> tag, the current node is the html element; then the </html> tag moves to the "after after frameset" mode, where another </frameset> tag switches back to "in frameset" and tries to pop the current node, now the html element. I would suggest just removing (fragment case), since that's what I've implemented.
...while I'm at it, I should make sure these get treated the same (right now they don't): <!DOCTYPE><html><frameset></frameset><html><frameset> <!DOCTYPE><html><frameset></frameset><frameset>
This ended up being a bigger problem, actually. Fixed.
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