The current en.wp version of [[Special:Search]] has the following:

<input name="fulltext" type="hidden" value="Advanced search" />
<input type="submit" value="Advanced search" name="fulltext" />

That means that two form field have the same name "fulltext". This breaks a script ([[MediaWiki:Common.js/search.js]]) in en.wp that has the line:

var lStat = searchForm.fulltext;

which now returns an array. This looks like a mistake, though might be intentional.

Version: unspecified
Severity: minor