Bug 99893 – When there are two elements with the same ID, xlink:href should refer to the first.

• Status: NEW
• Component: SVG

[Philip Rogers]

Created attachment 169732 [details]
Testcase

When there are two elements with the same ID, xlink:href should refer to the first, even if they are added to the document out of order.

Our current resource tracking implementation in SVGDocumentExtensions.cpp does not handle the case when a duplicate ID is added after (in document time) but before (in document order). See the attached testcase for an example.

<tref xlink:href="abcd"/>

<text id="abcd"> </text> <-- tref should point to the first text, even if it is dynamically added after the other duplicated id.
<text id="abcd"> </text>

[Florin Malita]

(In reply to comment #0)
> When there are two elements with the same ID, xlink:href should refer to the first

Is this behavior required by some spec? I can't easily find it, and I would have thought this is undefined.

[Ryosuke Niwa]

This bug still exists.

[Ahmad Saleem]

I am reproduce this bug in Safari 15.5 on macOS 12.4 using attached test case. It shows "FAIL" in green text while all other browsers (Chrome Canary 105 and Firefox Nightly 104) does not show anything at all (not even PASS). Thanks!

[Radar WebKit Bug Importer]

<rdar://problem/97098045>

[Ryosuke Niwa]

Pull request: https://github.com/WebKit/WebKit/pull/16145