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Hixie points out at least once problem in it's behavior: <template><frame><frameset> .. (can now never close the <frameset> And <frameset> has been deprecated for quite some time. I'm fine just removing it. I'd need to look to see what this would mean. Opinions?
we should probably set frameset-ok to "not ok" when we see <template>, too, just to avoid the crazy stuff like <body><template></template><frameset> nuking the template while <body><template>x</template><frameset> doesn't (mind you, same thing happens with <body><p><frameset> vs <body><p>x<frameset>, so I'm not _too_ worried about this case).
I see no problem with nuking it. Nobody should be using <frameset> anyway.
I'm surprised to hear <template><frameset> was even allowed before, so I'm happy to get rid of it.
HTML5.1 Bugzilla Bug Triage: Fixed (by prior WHATWG commit) in template mode switches to frameset "not ok" causing it to be ignored. If this resolution is not satisfactory, please copy the relevant bug details/proposal into a new issue at the W3C HTML5 Issue tracker: https://github.com/w3c/html/issues/new where it will be re-triaged. Thanks!