Here is an example of this issue. Steps to reproduce it:
Description: on every button click the 'slideDown' and the 'slideUp' methods are called for the 'box' element in rotation.
This stems from a rather curious height/width exception, ultimately dating all the way back to jQuery 1.0: http://jsfiddle.net/j53j1mLq/1/.
I doubt it's still relevant, and would be comfortable removing it. Any objections, @jquery/core?
Seems safe to remove to me - So long as IE whatever doesn't throw problems if we try to set width/height to 0 (but I think we were guarding that somewhere else anyway recently) - Also, lol at that comment on that line back in 1.0 :)
If it works fine in IE8 without this hack, 👍 for removing.
Great, so who can identify what the problematic behavior actually was? "IE flicker" isn't quite precise enough for me.
only @jeresig probably
Lord knows - probably for IE 5 or something. Feel free to nuke if you can't reproduce!
Effects: remove width/height exception for oldIE