MediaWiki r62191 - Code Review

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Revision:r62190‎ | r62191 (on ViewVC)‎ | r62192 >
Date:19:51, 9 February 2010
Status:resolved (Comments)
bug #19334: textarea jumps when editing longer articles in IE8
Modified paths:

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Follow-up revisions

Rev.Commit summaryAuthorDate
r62276Add comment for r62191simetrical23:02, 10 February 2010
r67455UsabilityInitiative: (bug 19334) Textarea jumps when editing articles in IE8....catrope11:28, 6 June 2010


#Comment by Simetrical (talk | contribs)   21:50, 10 February 2010

The fix seems very weird. Where did you get it? Does it have any side effects? I wasn't able to reproduce the problem at all.

#Comment by Jack Phoenix (talk | contribs)   22:26, 10 February 2010

The bug was first documented by Alex Grant on his blog (, and he posted an alternative, CSS-based fix there (as opposed to adding the meta tag). This patch is based on the info on Alex's blog and Wikia's solution (see

I myself had experienced the bug when editing longer pages. Someone else also noticed this bug back in April 2009 (see

For testing, I copied to my localhost development wiki and tried editing some of the sections in about the middle of the page (i.e. "Day 5") without using section edit links. Before applying this patch, editing the "Day 5" section (for example) was pretty much impossible. After applying this patch, editing works just as it should.

#Comment by Simetrical (talk | contribs)   23:06, 10 February 2010

Great, thanks for the info. I've added a comment to the file in r62276. Why the height specification, though? Is that needed? Presumably it will change display, and doesn't seem to be necessary according to your links.

Also, shouldn't your selector really be "textarea" here, not "#wpTextbox1"? Nothing sets #wpTextbox1 to 100% width, only textarea, AFAICT. So the fix won't work properly on edit conflict resolution, say. I'd think the rule should apply to all textareas, and be loaded on all pages.

As an alternative implementation, we could put the fix in shared.css directly, and then use a * html hack or such to override it for IE6, since that doesn't support min/max-width. Currently only Monobook, Vector, Modern, Chick, and Simple set textareas to 100% width, but it probably doesn't hurt if we extend that to all other skins too.

#Comment by Jack Phoenix (talk | contribs)   23:33, 10 February 2010

Without the height property, the bug occurs in my IE8 — dunno why, but that's just the way it is. Using textarea instead of #wpTextbox1 (with or without height) doesn't seem to work. The current CSS works for me even in edit conflict cases.

Using shared.css instead of a separate file sounds like a good idea to me.

#Comment by Skizzerz (talk | contribs)   21:56, 16 February 2010

I can verify that this bug was there before and not after these CSS changes, suggesting that it be marked as resolved/ok

#Comment by Simetrical (talk | contribs)   00:10, 17 February 2010

There are unresolved issues — for instance, it forces widths to 100% in IE8 even in skins where this isn't normally the case, like Cologne Blue. I'm meaning to test it and see if I can improve the fix, if no one else does, but I haven't found the time yet.

#Comment by Simetrical (talk | contribs)   19:53, 24 May 2010

Okay, I obviously just don't care enough about IE8. So it would be nice if this could be fixed, but I'm not going to do it, and clearly no one else is. Dunno if we should keep this marked fixme in that case, it seems pointless.

#Comment by Justingrant~mediawikiwiki (talk | contribs)   23:45, 28 May 2010

In addition to skin problems noted above, the checked-in fix may not actually fix the problem in all cases. Instead, another fix is to simply set the COLS attribute of the textarea to a very large number (e.g. 5000). This seems to work in every case I've tried, and doesn't break skins or other CSS.

more details: After an hour investigating this, the problem seems to be caused by IE8's handling of a conflict between "COLS" attribute and "width" style on a textarea element. If the width CSS is wider than the default width (font width x cols), IE8 gets confused when you add text and scrolls the textarea. If, instead, the width CSS is smaller than the default width derived from the cols attribute, then all works OK.

The subtle dependence between cols and width is perhaps what makes the problem so tricky to repro, because the same exact page would break or not break depending on the ratio of cols to width. It's easy to build a page which reproes on a large browser window and doesn't repro on a small one!

Status & tagging log

  • 19:27, 4 June 2010 Catrope (talk | contribs) changed the status of r62191 [removed: fixme added: resolved]
  • 23:06, 10 February 2010 Simetrical (talk | contribs) changed the status of r62191 [removed: new added: fixme]