The one curious answer is <html> - in HTML it is actually rather impotent at this point. One might even suggest it's no longer root.

Apr 30, 2015 路 2:36 AM UTC

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Replying to @mholzschlag
@mollydotcom old-school IE6 CSS hacks suggest it never was ...
Replying to @mholzschlag
@mollydotcom Does <!DOCTYPE> count? It makes or, more often, breaks websites.
Replying to @mholzschlag
@mollydotcom same comment as title :)