On Mon, 30 Apr 2007, Glen Lipka wrote:

> My IE7 crashes if I look at the following source:

Mine does too, after "thinking" some time. This does not happen if I 
remove the <style> element, making the issue CSS-related, but the basic 
issue is markup.

>  <a href="">Link1<span /></a>
- -
> It doesn't crash if I am explicit with <span></span>

According to the XHTML 1.0 specification, you should not use <span /> but 
<span></span>. More generally, in XHTML 1.0, the <tagname /> construct 
should be used if and only if the element's content model is EMPTY, i.e. 
no content is ever allowed by the syntax rules. Ref.:
http://www.w3.org/TR/xhtml1/#guidelines
(Technically, Appendix C is informative, not normative; but the XML 1.0 
specification says: "For interoperability, the empty-element tag SHOULD be 
used, and SHOULD only be used, for elements which are declared EMPTY."
Ref.: http://www.w3.org/TR/REC-xml/#sec-starttags )

What happens on IE is that the "/" in <span /> is ignored, treating it as 
the lone start tag <span>. If you remove the "/" characters, IE 7 still 
crashes.

(IE does not understand XHTML. If you send XHTML to it labelled as 
text/html, it will treat it as HTML, or rather the same way it treats 
HTML.)

> It doesn't crash if I only have 1 link.

I guess IE gets confused when it sees two <span> tags with no end tag for 
either of them, though only when you ask it to apply your style sheet.

> Is <span /> illegal?

Not in XHTML, but it should not be used in any context where your document 
might be processed by old HTML browsers like IE.

> Why would this crash IE7?

Who knows what really happens? But basically you have (when your document 
is processed as HTML) two elements that need end tags but don't have them, 
so it's not surprising that IE crashes when there are style sheets to be 
applied to them.

-- 
Jukka "Yucca" Korpela, http://www.cs.tut.fi/~jkorpela/

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