155046 - acronym:hover inside a p:first-line creates more content on mouseout

Status: RESOLVED DUPLICATE of bug 177539

(Core :: CSS Parsing and Computation, defect)

Description

[Kevin Cook]

When acronym:hover is used inside a <p> with a first-line style, the mouseout
phase of hover sometimes causes the text inside the tag to be duplicated.  
During the mouseover phase, the text inside the acronym tag receives the
assigned style as intended.  When the mouse moves off the text, one expects the
text to be re-rendered in its original pre-hover state.  Instead, it remains on
the screen with the hover style applied, and a copy of the text in the original
unhovered style is created next to it.

Use the sample URL at http://www.priss.org/mozbug/acronymtest.htm and hover on
several of the acronyms until the effect begins to appear.  It doesn't happen
every single time, but doesn't take long to begin.

Comment 1

[Boris Zbarsky [:bzbarsky]]

seeing this on Linux too.

Comment 2

[Stuart Johnston]

Attachment: Simplified Test Case

I've attached a simplified test case.  Also, bugs 23701, 143775, and 163183 all
seem to be related to this bug. Not sure which to call the dups.  BTW, I first
noticed this bug on http://bumbershoot.com

Comment 3

[Peter Logan]

This bug shows up on any a:hover elements within an absolutely positioned
division, not just acronyms or blocks of p:first-line. For an example, see
http://www.as.ua.edu/english/ref/webfaq.htm . The browser width affect the
behavior, so you'll have to run you cursor over many of the links to see them
spawn copies of themselves.

Comment 4

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

*** This bug has been marked as a duplicate of 177539 ***