Chrome Version: 59.0.3046.0 (Official Build) canary (64-bit)

Test: http://software.hixie.ch/utilities/js/live-dom-viewer/saved/4976

Result in Chrome canary:
log: <dialog><p></dialog>x
log: <p><dialog>
log: DONE

Expect:
log: DONE

The HTML parser does not close the p for </dialog> in the first test, and doesn't close the p for <dialog> in the second test.

HTML standard:
[[
A start tag whose tag name is one of: "address", "article", "aside", "blockquote", "center", "details", "dialog", "dir", "div", "dl", "fieldset", "figcaption", "figure", "footer", "header", "hgroup", "main", "menu", "nav", "ol", "p", "section", "summary", "ul"
If the stack of open elements has a p element in button scope, then close a p element.

Insert an HTML element for the token.
]]

[[
An end tag whose tag name is one of: "address", "article", "aside", "blockquote", "button", "center", "details", "dialog", "dir", "div", "dl", "fieldset", "figcaption", "figure", "footer", "header", "hgroup", "listing", "main", "menu", "nav", "ol", "pre", "section", "summary", "ul"
[...handling of end tag...]
]]

html5lib-tests PR:
https://github.com/html5lib/html5lib-tests/pull/91

Test passes in Firefox Nightly. Fails in Safari TP.