547854 - Improve outermost <svg:title> tooltip behavior

Status: RESOLVED FIXED

(Firefox :: General, defect)

Description

[Helder "Lthere" Magalhães]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.3a2pre) Gecko/20100222 Minefield/3.7a2pre (.NET CLR 3.5.30729)

After bug 329212 was marked fixed, further testing showed that the current behavior may need a bit of love... :-)

Specifically, I've noticed that the outermost title is being used every time a given element doesn't specify any. Just leaving the mouse parked somewhere displays "This is a root SVG element's title" which doesn't feel expected behavior IMHO: AFAIK, the top-level title/desc should be handled specially -- it's intended to provide generic information about the document itself:
 * The outermost "title" element would (only) be used as window title, as already was in previous versions;
 * The outermost "desc" element would be used as document information, possibly in page info document properties dialog (maybe displayed like meta tags in HTML pages), something which was never supported.

Note that there's an algorithm [1], proposed by the SVG IG, as implementation proposal.

[1] http://www.w3.org/Graphics/SVG/IG/wiki/Accessibility_Activity#Title_As_Tooltip

Reproducible: Always

Steps to Reproduce:
1. Open a document with an outermost title element.

Actual Results:  
The outermost title element is used as tooltip for the canvas and/or elements which don't hold a title element themselves.

Expected Results:  
The outermost title element would only be used as document title.

Originally reported in bug 329212 comment 61.

Note that I'm pointing the bug's URL at the current SVG 1.1 Second Edition editor's draft which, although not ratified yet, should be fairly close to the final document. :-)

Comment 1

[Helder "Lthere" Magalhães]

Attachment: Testcase

Comment 2

[Robert Longson [:longsonr]]

If you want something for SVG desc on the page info that's a different issue.

Comment 3

[Robert Longson [:longsonr]]

Attachment: WIP

Comment 4

[Robert Longson [:longsonr]]

Attachment: patch

Comment 5

[Boris Zbarsky [:bzbarsky]]

Comment on attachment 428989 [details] [diff] [review]
patch

"ShouldUseSVGTitle" in the comment should be updated to match the code.

Comment 6

[Robert Longson [:longsonr]]

pushed http://hg.mozilla.org/mozilla-central/rev/9c1f93a599ce