294653 - Scrollbars incorrect for <textarea> on OS X

Status: RESOLVED INCOMPLETE

(Core Graveyard :: Widget: Mac, defect)

Description

[Mike Shaver (:shaver emeritus)]

(Others were not seeing this on Linux and Win32, so I'm filing against Widget:
Mac for now.)

On the linked page, there is a <textarea> containing a fair bit of XML markup. 
It extends beyond the size of the <textarea>, but the scrollbar on it will only
move a tiny amount (the thumb is > 90% of the height of the scrollbar) and has
no effect on the portion of the markup visible in the <textarea>.

If I select-drag past the end of the visible text, the scrollbar is repaired and
I can manipulate it normally.  (I still don't get a caret when I click in the
<textarea>, but that's a separate bug.)

Comment 1

[Uri Bernstein]

Attachment: testcase

The yellowish background is just to show where the textarea is.
Scrolling the textarea (by dragging the text, or using the keyboard) causes
scrollbars to appear. hovering these scrollbars hides them again.

Other things to notice:
-The caret is also invisible in the textarea.
-The div with "overflow: scroll;" shouldn't really have any scrollbars (this is
bug  274036). This is the "90%" scrollbar seen in the original page - it is
actually not the textarea's scrollbar.
-Making the div smaller, so that it covers only part of the textarea, causes
the textarea's scrollbar to be partially visible 9the part insie the div is
still hidden).

Comment 2

[Simon Fraser [no longer active]]

The drawing issue with the vertical scrollbar is caused by the position:absolute
style. This is probably a dup of other such bugs.