Last modified: 2014-06-01 12:43:30 UTC

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Bug 12456 - Links surrounding images always have a title, even if alt text is empty
Links surrounding images always have a title, even if alt text is empty
Product: MediaWiki
Classification: Unclassified
Parser (Other open bugs)
All All
: Low minor (vote)
: ---
Assigned To: Nobody - You can work on this!
: need-parsertest, patch, patch-reviewed
Depends on:
  Show dependency treegraph
Reported: 2007-12-30 16:14 UTC by Thomas Bleher
Modified: 2014-06-01 12:43 UTC (History)
4 users (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---


Description Thomas Bleher 2007-12-30 16:14:42 UTC
Using the new parser, using [[Image:some.png|<nowiki/>]] does not work anymore, i.e. it produces an alt text of "some.png", when it should be empty. demonstrates the problem (the site was updated from SVN a few days ago).

I cannot reproduce this on Wikipedia sites; I think it works there because Wikipedia is still using the old parser.
Comment 1 Thomas Bleher 2008-01-03 19:11:20 UTC
I have to correct myself: It doesn't seem to be a bug of the new parser (at least I can now reproduce it using the old parser) and the alt text is in fact correct. The problem is that the surrounding link has a 'title' attribute, so the HTML produced for [[Image:some.png|<nowiki/>]] is

  <a href="/wiki/Image:Some.png" class="image" title="Some.png"><img alt="" src="some path" width="474" height="466" border="0" /></a>

when it should be

  <a href="/wiki/Image:Some.png" class="image" title=""><img alt="" src="some path" width="474" height="466" border="0" /></a>

leading to a tooltip with "Some.png" in it when hovering over the image (at least in Firefox and Konqueror).

I still think this is a bug, but at least it should not affect screen readers and the like, so I'm reducing the severity.
Comment 2 Thomas Bleher 2008-01-03 19:50:02 UTC
Proposed patch:

--- includes/MediaTransformOutput.php   (Revision 29164)
+++ includes/MediaTransformOutput.php   (Arbeitskopie)
@@ -76,10 +76,6 @@

        function getDescLinkAttribs( $alt = false ) {
                $query = $this->page ? ( 'page=' . urlencode( $this->page ) ) : '';
-               $title = $this->file->getTitle();
-               if ( strval( $alt ) === '' ) {
-                       $alt = $title->getText();
-               }
                return array(
                        'href' => $this->file->getTitle()->getLocalURL( $query ),
                        'class' => 'image',

Sidenote: Looking through the parser tests, I saw that [[Image:Some.png]] has an alt-text, while [[Image:Some.png|right]] doesn't have one. I think that's a bug, too, but a very low priority one.
Comment 3 Sumana Harihareswara 2011-09-26 15:49:06 UTC
Thomas, can you check whether your proposed patch works against current trunk, and attach it to this bug as a diff?  Thanks!
Comment 4 Thomas Bleher 2011-09-28 21:53:27 UTC
I'm sorry, but I don't currently have any time for MediaWiki development. So if someone else could check this, it would be great :)
Comment 5 John Du Hart 2011-09-29 20:09:43 UTC
Patch no longer works against trunk, however I'll take a look at fixing the bug.
Comment 6 John Du Hart 2011-09-29 20:14:28 UTC
But isn't a file name better than an empty alt="" tag? I think that the current behavior is more desirable. Is there a case where you feel it isn't?
Comment 7 Thomas Bleher 2011-09-29 20:25:50 UTC
Some images are purely for decoration, they should not produce any text in a screenreader or text-only browser. As a random example, look at the headings in . On that wiki, there are standardized headings, each containing an image on the left, to make the sections stand out. But a screenreader should completely ignore these images.

I think MediaWiki should provide a syntax to achieve this. It used to work by adding <nowiki/> as the title, like this: [[Image:some.png|<nowiki/>]]
Comment 8 C. Scott Ananian 2014-05-29 20:13:01 UTC
Doesn't [[Image:some.png|alt=]] do what you want?
Comment 9 Thomas Bleher 2014-06-01 12:43:30 UTC
I cannot reproduce the problem on MediaWiki 1.22 anymore. So apparently the bug has been fixed in the meantime.

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