Bug 9943 – REGRESSION (Tiger-TOT): menus are offset to the right at http://movies.aol.com/movie-photo-bts/superman-returns

• Status: RESOLVED
• Resolution: FIXED
• Component: DOM

[Darin Adler]

<rdar://problem/4590613>

* SUMMARY
drop down menus at http://movies.aol.com/movie-photo-bts/superman-returns have regressed.  they are being rendered off the to the right.  

* STEPS TO REPRODUCE
0. TOT
1. http://movies.aol.com/movie-photo-bts/superman-returns
2. mouse over the menu bar with items such as "main", "showtimes & tix" "reviews & picks" , etc. 

* RESULTS
menus aren't drawn in correct position

* REGRESSION
this is a regression from Tiger Safari.  

[Darin Adler]

I can't figure out why this worked in Tiger, but I do see what's going wrong.

The relevant function is this one, from channels.js:

function bb_left(o){
	var x=0;
	while(o.offsetParent){
		x+=o.offsetLeft;
		o=o.offsetParent;
	}
//	x+=o.offsetLeft;	
	return x;
}

In Firefox this works because the body has an offsetLeft of 0. In WebKit, the offsetLeft is the distance from the left side of the body to the left side of the window.

[Darin Adler]

Created attachment 9471 [details]
test case to demonstrate difference in body offset properties

[Darin Adler]

Created attachment 9472 [details]
patch, including change log and a layout test

[John Sullivan]

Comment on attachment 9472 [details]
patch, including change log and a layout test

r=me

[Darin Adler]

Created attachment 9501 [details]
these additional corrections to layout tests also need to be landed

[Darin Adler]

Committed revision 15471.