1259437 - -moz-box children with position:relative move permanently on hover

Status: REOPENED

(Core :: Layout, defect)

Description

[henriksnes]

Attachment: reporter's testcase (only reproduces in builds without webkit prefix support)

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36

Steps to reproduce:

1. Load up the provided index.html in Firefox 45.0.1
2. Hover over either of the two sections


Actual results:

The <section> will move up, and never come back down. Hovering over it again will make it move further up.


Expected results:

When the hover ends, the hover rule, top:-10px, should stop taking effect, and the <section> should come back down to its original position.

This bug seems to be fixed in the latest trunk, but I didn't see any bug reports about it, so I'm submitting it in case it might lead to a regression test that prevents it from regressing again.

Comment 1

[Daniel Holbert [:dholbert]]

This isn't related to bug 1213126 [removing "blocks" relationship], and it's not fixed -- it's just a bug that specifically affects "display:-moz-box" elements. (and this particular testcase happens to have its moz-box styling suppressed if we enable webkit prefix support)

I'll attach a testcase that still reproduces this in Nightly, without any webkit stuff.

Comment 2

[Daniel Holbert [:dholbert]]

Attachment: reduced testcase 1