On Wed, Jul 20, 2011 at 9:40 AM, Daniel Barrett danb@vistaprint.com wrote:

Since upgrading to MediaWiki 1.17.0, I'm seeing a host of new warnings in Firefox's 3.6's error console, attributed to mediawiki.legacy.commonPrint:

Warning: Expected 'important' but found 'ie'. Source File: http://mywiki.net/w/load.php?debug=false&lang=en&modules=mediawiki.l... Line: 1

and various others. Are these bugs or a misconfiguration on my end?

These are I believe harmless -- Firefox's classic error console spews a *lot* of totally irrelevant CSS warnings. This particular bit is about a pattern that our CSS postprocessing does to handle embedding small images:

a.feedlink{ background:url(data:image/png;base64,iVBORw0K....CYII=) center left no-repeat; background:url( http://stormcloud.local/trunk/skins/common/images/feed-icon.png?2011-01-22T0...) center left no-repeat!ie; }

A single rule specifying an embeddable file by local path is transformed into two rules: the first using an embedded data: URI, so most browsers don't have to make a separate HTTP request to get a tiny icon. The second line references the original file via an expanded full URL. I believe the '!ie' on the end is a trick to get other browsers to ignore it, while IE still takes them. (IE's support for data URIs is missing or broken in some old versions).

-- brion