User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20100101 Firefox/12.0 Build ID: 20120420145725 Steps to reproduce: Viewed the attached ff12_datepicker.html Actual results: Horizontal scroll bar didn't appear even though table overflowed page width until one of the jQuery datepicker elements was activated. Viewed same page in Chrome, IE and FF11. Paged worked as expected in those browsers. Expected results: Horizontal scroll bar should have appeared when page loaded. This is possibly a dupe of 750323.

Regression window(m-c) Works: http://hg.mozilla.org/mozilla-central/rev/0b4c58200e3a Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120117 Firefox/12.0a1 ID:20120117042508 Fails: http://hg.mozilla.org/mozilla-central/rev/ff1bedd7d463 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120117 Firefox/12.0a1 ID:20120117072408 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=0b4c58200e3a&tochange=ff1bedd7d463 Regression window(m-i) Works: http://hg.mozilla.org/integration/mozilla-inbound/rev/7ea3311b5e6c Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120116 Firefox/12.0a1 ID:20120116145408 Fails: http://hg.mozilla.org/integration/mozilla-inbound/rev/3077b729dfd5 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120116 Firefox/12.0a1 ID:20120116153908 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=7ea3311b5e6c&tochange=3077b729dfd5 Last good: 804c80adda0a First bad: 87536f378706

Requesting tracking for the regression....

roc - can you find an assignee for this reproducible regression? Thanks!

I'll take a look...

The jquery.datepicker script inserts a <div> with style: .ui-helper-hidden-accessible { position: absolute; left: -99999999px; } Reducing the left offset by a magnitude makes the scrollbar display. So this is basically a dupe of bug 749935.

untracking in favour of bug 749935 which is awaiting nominations for landing to beta/aurora.

The patch of bug 749935 landed in 13.0 and 14.0.

Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20100101 Firefox/13.0 Verified using attachment test case in Ubuntu 12.04, Mac OS 10.6, Windows 7. Firefox 13 beta 6. Horizontal bar is displayed as expected.

I've just experienced this as well. Use of jQuery UI Datepicker on page, prevents Firefox from displaying horizontal scrollbar -- needed in this app's UI for viewing/editing a very wide table. Thanks 'iop' for his CSS patch; reducing the magnitude of 'negative left hiding' to -9999999, rather than -99999999 (7 nines rather than 8).

Thomas, what build did you test? This is supposed to be fixed now in Firefox 13.0b6, latest-mozilla-aurora, and latest-mozilla-central. It is not fixed in Firefox 12 and earlier, nor will it be.

Mozilla/5.0 (X11; Linux i686; rv:15.0) Gecko/20120614 Firefox/15.0a2 Mozilla/5.0 (X11; Linux i686; rv:14.0) Gecko/20100101 Firefox/14.0 Verified using attachment test case on Firefox 14b7, Aurora on Ubuntu 12.04, Mac OS 10.6, Windows XP. Horizontal bar is displayed.

Hi Anthony, yes that was at 12. Just letting you know this is occuring in the wild; JQuery components use these large -ve positions to hide, so the bug is relevant to a good number of users.