[Webkit-unassigned] [Bug 63232] New: Button is hidden unexpectadly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63232

           Summary: Button is hidden unexpectadly
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
               URL: http://economic.ideamanagment.ru/vk/
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: a.vostrjakov at gmail.com


At first I created this bug in chromium bug-tracker (http://code.google.com/p/chromium/issues/detail?id=87089). Chromium guys said that this bug in Webkit. So:

What steps will reproduce the problem?
1. Open link: http://economic.ideamanagment.ru/vk/  (sorry for russian language there)
2. Click in any text area with text "Оставить комментарий..." (you can see a button near text area on the right)
3. Go out from the text area and go in again

What is the expected result?
I can see the button near the text area.

What happens instead?
I don't see the button near the text area.

Please provide any additional information below.
Please, see attachments in http://code.google.com/p/chromium/issues/detail?id=87089

In Javascript (using jquery) I change css style for the button this way on focus and blur events:
$('#add_comment_92').css('display', 'inline-block'); - show
$('#add_comment_92').css('display', 'none'); - hide

or:
$('#add_comment_92').show();
$('#add_comment_92').hide();

Doesn't matter. And I'm sure that this bug is not in jquery.

UserAgentString: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_7) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.100 Safari/534.30

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