825743 - instanceof HTMLBodyElement is false for inserted HTMLBodyElement

Status: RESOLVED DUPLICATE of bug 824917

(Core :: DOM: Core & HTML, defect)

Description

[Edward]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.45 Safari/537.17

Steps to reproduce:

Tested this extension code in Firefox Nightly 20.0a1

window.document.addEventListener("DOMContentLoaded", function(evt) {
	if (evt.originalTarget instanceof HTMLDocument) {
		evt.originalTarget.addEventListener("DOMNodeInserted", function(evti) {
			if (evti.relatedNode.tagName == "BODY") {
				dump("Node: " + evti.relatedNode);
				dump(" / Test against instanceof HTMLBodyElement: "+ (evti.relatedNode instanceof HTMLBodyElement) +"\n");
			}
	}, true); }
}, true);



Actual results:

(evti.relatedNode instanceof HTMLBodyElement) was false for a HTMLBodyElement

Output:
Node: [object HTMLBodyElement] / Test against instanceof HTMLBodyElement: false


Expected results:

(evti.relatedNode instanceof HTMLBodyElement) should be true for a HTMLBodyElement

Output: (for example Firefox 17.0.1)
Node: [object HTMLBodyElement] / Test against instanceof HTMLBodyElement: true

Comment 1

[:Ms2ger (he/him; ⌚ UTC+1/+2)]

Thanks for the report. This should be fixed in tomorrow's nightly.

Comment 2

[Boris Zbarsky [:bzbarsky]]

Note that per spec the code above should in fact test false.  We might add a chrome-only spec violation, but that's what it would be: a spec violation....