W3C home > Mailing lists > Public > public-html@w3.org > July 2009

HTML 5 parser creating multiple body elements

From: Geoffrey Sneddon <gsneddon@opera.com>
Date: Thu, 16 Jul 2009 14:41:34 +0200
Message-ID: <4A5F1FFE.4070106@opera.com>
To: public-html@w3.org
Given the following:

<!doctype html>
<script>
document.documentElement.innerHTML = "<body bgcolor=green>";
</script>
<body bgcolor=red>

The HTML 5 parser creates:

doctype
html
	head
	body@bgcolor='green'
	body@bgcolor='red'

It would be desirable not to create multiple body elements.

In all shipping browsers this creates:

doctype
html
	head
	body@bgcolor='red'

This becomes more interesting once you add children to the body elements:

<!doctype html>
<script>
document.documentElement.innerHTML = "<body bgcolor=green>PASS";
</script>
<body bgcolor=red>
<p>FAIL

HTML 5:

doctype
html
	head
	body@bgcolor='green'
		"PASS"
	body@bgcolor='red'
		p
			"FAIL"

Firefox/Chromium:

doctype
html
	"PASS"
	body@bgcolor='red'
		p
			"FAIL"

Opera:

doctype
html
	head
	body@bgcolor='red'
		"PASS"
	p
		"FAIL"

IE8 forbids setting innerHTML on the html element, so:

doctype
html
	head
		title
			""
		script
			"document.documentElement.innerHTML = "<body bgcolor=green>PASS";"
	body@bgcolor='red'
		p
			"FAIL"

None of these options seem very nice (HTML5 because it results in 
multiple body elements; Firefox/Chromium as they result in a text node 
child of the HTML element; Opera because it results in a P element child 
of the HTML element; IE because it disallows innerHTML). As IE throws 
when trying to set innerHTML on the HTML element (which, AFAIK, is the 
only case in which this can occur), I find it doubtful any sites depend 
on any specific behaviour, though it seems nicest to avoid having 
multiple body elements, and treating it closer to two body elements in 
the token stream.

-- 
Geoffrey Sneddon  Opera Software
<http://gsnedders.com/>
<http://www.opera.com/>
Received on Thursday, 16 July 2009 12:42:15 UTC

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