Bug 74468

Summary: Incorrect behavior for HTMLCollection.prototype.item(someString)
Product: WebKit Reporter: Boris Zbarsky <bzbarsky>
Component: DOMAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: abarth, ap, arv, japhet, kling, Ms2ger, ojan, rniwa, sam, webkit.review.bot
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Testcase
none
Patch none

Description Boris Zbarsky 2011-12-13 17:29:47 PST 
Created attachment 119120 [details]
Testcase

Webkit apparently treats item() on form.elements and other HTMLCollections as an alias for namedItem if a string is passed or something.  This is wrong per the spec at http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#htmlformcontrolscollection as well as per the DOM 2 HTML spec.  See the attached testcase; it should say "PASS" twice.

BUILD: Current WebKit nightly.

STEPS TO REPRODUCE:
Load attached testcase.

EXPECTED RESULTS: 2 lines that say "PASS"

ACTUAL RESULTS: 2 lines that say "FAIL"

Gecko and Presto both get this right.
Comment 1 Alexey Proskuryakov 2011-12-14 10:54:06 PST 
> Gecko and Presto both get this right.

This behavior was implemented in bug 11078 precisely to match Gecko and Presto (and document.all.item(someString) still works in Firefox 8.0.1). It might have gotten unintentionally extended to other versions of item() with code refactorings over the years.

We should investigate which versions of item() need to fall back to namedItem().
Comment 2 Boris Zbarsky 2011-12-14 11:06:24 PST 
Yeah, document.all is not an HTMLCollection and has completely different item() behavior in Firefox.

Per HTML5 spec, it's an HTMLCollection, though.  The spec probably needs fixing.
Comment 3 Boris Zbarsky 2011-12-14 11:08:07 PST 
I filed https://www.w3.org/Bugs/Public/show_bug.cgi?id=15184
Comment 4 Ryosuke Niwa 2011-12-14 16:00:57 PST 
*** Bug 74546 has been marked as a duplicate of this bug. ***
Comment 5 Pablo Flouret 2012-01-25 01:29:33 PST 
Created attachment 123898 [details]
Patch
Comment 6 Adam Barth 2012-01-25 01:35:22 PST 
Comment on attachment 123898 [details]
Patch

This didn't cause any other tests to fail?  Do we know the history of this code?  Why does WebKit have this behavior?
Comment 7 Adam Barth 2012-01-25 01:36:04 PST 
Comment on attachment 123898 [details]
Patch

Ah, I see that Alexey answered that question above.
Comment 8 WebKit Review Bot 2012-01-25 05:04:40 PST 
Comment on attachment 123898 [details]
Patch

Clearing flags on attachment: 123898

Committed r105870: <http://trac.webkit.org/changeset/105870>
Comment 9 WebKit Review Bot 2012-01-25 05:04:49 PST 
All reviewed patches have been landed.  Closing bug.