[whatwg] Why do HTML*Collection's nameItem need to return 5 different objects?

Simon Pieters simonp at opera.com
Thu Sep 6 01:46:34 PDT 2012

On Wed, 05 Sep 2012 22:47:07 +0200, Ian Hickson <ian at hixie.ch> wrote:

>    http://software.hixie.ch/utilities/js/live-dom-viewer/saved/1736
> Webkit returns undefined, whereas IE, Gecko, and Opera all return an
> HTMLCollection. (IE returns an HTMLCollection with a tags() method, Gecko
> and Opera do not. The spec requires an HTMLAllCollection, which is the
> kind of collection that has a tags() method in the spec; in IE, all
> collections have a tags() method, and document.all is actually a regular
> HTMLCollection. We could change the spec here, e.g. to put tags() on all
> collections or to just forget about tags() on the subcollection here.)

I thought we had agreed to drop tags() everywhere except for the  
document.all collection. I guess the collection returned by  
document.all.foo wasn't discussed back then, though. Opera and Firefox  
don't support tags() there, which suggests it's not needed for compat, so  
maybe the spec should side with Opera/Firefox and return HTMLCollection  
instead of HTMLAllCollection.

Simon Pieters
Opera Software

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