509241 - localStorage.key(localStorage.length) not returning null as W3C spec says it should

Status: RESOLVED DUPLICATE of bug 738647

(Core :: DOM: Core & HTML, defect)

Description

[Brett C.]

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.1) Gecko/20090715 Firefox/3.5.1
Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.1) Gecko/20090715 Firefox/3.5.1

The W3C Web Storage spec on localStorage.key() (http://dev.w3.org/html5/webstorage/#dom-storage-key) says that when an argument equal to or greater than the number of entries is given that null should be returned. But in fact an exception is currently being raised.

Reproducible: Always

Steps to Reproduce:
1. run ``localStorage.key(localStorage.length)``
2. Note the raised exception and how null is not returned as expected.
Actual Results:  
[Exception... "Index or size is negative or greater than the allowed amount" code: "1" nsresult: "0x80530001 (NS_ERROR_DOM_INDEX_SIZE_ERR)"

Expected Results:  
null should be returned.

Comment 1

[Dirkjan Ochtman (:djc)]

Reset product/component to something hopefully more sane.

Comment 2

[Nickolay_Ponomarev]

Confirming on Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.3a1pre) Gecko/20090919 Minefield/3.7a1pre

See the URL for the testcase.

Comment 3

[Paul van Eijden]

This bug is still current, on Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:5.0.1) Gecko/20100101 Firefox/5.0.1

Comment 4

[Honza Bambas (:mayhemer)]

Not time to work on this right now.

Comment 5

[:Ms2ger (he/him; ⌚ UTC+1/+2)]

Duping forward to bug 738647, because that one has a patch.