Totally broken; breaks at least Vector skin and any other which includes an initially-hidden div for the JS messages -- the div was no longer being unhidden.
Just use a !important in your custom style...
* (bug 20702) Parser functions can now be used correctly in
MediaWiki:Missing-article
* (bug 14117) "redirected from" is now also shown on foreign file redirects
-* (bug 18436) JavaScript-added AJAX messages (from the JS watch/unwatch, for
- instance) no longer include a redundant "display:block" hardcoded style.
* (bug 20802) Fixed thumb.php redirect handling
* (bug 17747) Only display thumbnail column in file history if the image can
be rendered.
}
messageDiv.setAttribute( 'id', 'mw-js-message' );
+ messageDiv.style.display = 'block';
if( className ) {
messageDiv.setAttribute( 'class', 'mw-js-message-'+className );
}