Case 3 is probably specific to [[mw:Extension:ImageMap]], while the first two use cases are in MediaWiki core.

Wiki.Melancholie wrote:

Note that, although alt="tooltip" is available in source code and thus probably shown as fallback tooltip with IEs, all other web browsers rely on title="tooltip" to be specified. But title="" is missing.
See https://bugzilla.wikimedia.org/show_bug.cgi?id=17044#c1

ayg wrote:

*** Bug 17044 has been marked as a duplicate of this bug. ***

ayg wrote:

The HTML for case 1 looks like

<a href="http://commons.wikimedia.org/wiki/" title="commons:"><img alt="Commons" src="http://upload.wikimedia.org/wikipedia/commons/9/9d/Commons-logo-31px.png" width="31" border="0" height="41"></a>

The unnamed parameter is eaten in favor of the default link tooltip. This is wrong. This is probably a simple change to Parser::makeImage() to fix; it might be necessary to look a couple of levels down at the stuff it calls.

allstarecho wrote:

Any progress 5 months later on this issue?

ayg wrote:

Apparently not.

Created attachment 6116
Patch to set a's title= for [[Image:..|link=]]

I've been hunting around, and I think this patch should fix the problem. The code is untested, because i don't run a mediawiki installation, but should be easy to verify.

Attached:

ayg wrote:

• $linkAttribs = array( 'href' => $options['custom-url-link'] );

+ $linkAttribs = array( 'href' => $options['custom-url-link'], 'title' => $alt );

This wasn't right -- it was adding an empty title if the alt text was empty, which I don't think we want. Other than that, it tested out fine. Committed as r50641.

allstarecho wrote:

So does that mean it's fixed? It's still not working at http://en.wikipedia.org/wiki/Template:Click/doc in the examples there.

...which would be because Wikipedia isn't running r50641 yet, see [[Special:Version]] (currently at r48811).
But still, it will be available fairly soon.

ayg wrote:

It will be available (assuming all goes well) at the next scap, which may or may not be fairly soon. The last scap was close to two months ago, and who knows when the next one will be. But it should work when [[Special:Version]] gets to r50641 or later.