[Webkit-unassigned] [Bug 77899] IETC: FileList.item(-1) should return null instead of raising

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=77899





--- Comment #21 from Kentaro Hara <haraken at chromium.org>  2012-06-04 18:18:44 PST ---
(From update of attachment 145671)
View in context: https://bugs.webkit.org/attachment.cgi?id=145671&action=review

Let me confirm my understanding:

- Per the Web IDL spec, ToUint32() is called. -1 is converted to 4294967295.
- files.item(-1) will return the same item as files.item(4294967295).
- Given that there is no item in the 4294967295th index, files.item(-1) returns null.
- Firefox11 and IE10 also return null for files.item(-1).
- Consequently, this change follows the spec and does not violate cross-browser compatibility.

Is my understanding correct? (If so, the change looks reasonable to me.)

> LayoutTests/fast/files/file-list-test.html:24
> +    shouldBeNull("files.item(-1)");

Shall we add a test for files.item(4294967295)?

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