1265239 - Mouse events ignored in overflow:hidden regions for elements nested under multiple levels of position:fixed, version 2

Status: RESOLVED DUPLICATE of bug 1275411

(Core :: Layout, defect)

Description

[Till Schneidereit [:till]]

This is very similar to bug 1265237, but it happens in all versions at least back to 45, regardless of whether e10s is enabled or not. Might be a site-compat issue more than a spec issue.

STR:
1. visit http://codepen.io/anon/pen/mPLpdP
2. move mouse over "some link"
3. observe how the link is only active inside the gray rectangle
4. repeat steps 1-3 in Chrome, observe how the link is active everywhere

(I should note that Safari has the exactly opposite behavior: the link is visually hidden in the overflow region, but receives mouse events.)

Comment 1

[Olli Pettay [:smaug][[e-mail]]]

No idea whether this is a bug or not, but hit testing is more like a layout issue (or possibly Event Handling).

Comment 2

[Timothy Nikkel (:tnikkel)]

I think I reproduced on a build from the date of filing this bug and I bisected to find what fixed this, I got

https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=b0096c5c727749ad3e79cbdf20d2e96bd179c213&tochange=4d63dde701b47b8661ab7990f197b6b60e543839

Which I'm pretty sure is bug 1275411