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http://html-differences.whatwg.org/#new-elements [[ WHATWG HTML has dialog for showing a dialog. ]] so does 5 and 5.1 http://www.w3.org/html/wg/drafts/html/master/interactive-elements.html#the-dialog-element
https://github.com/whatwg/html-differences/commit/8b5f30c9716f50d355631473c7b95c7c58760744 https://github.com/whatwg/html-differences/commit/a6559b20ac888e26283c438a8e41706fd96287e5