1314422 - Sticky position outside scroll clip can cause scroller to grow infinitely.

Status: REOPENED

(Core :: Layout, defect)

Description

[Robert Flack]

Attachment: Test page with sticky element stuck below scroller clip.

User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Steps to reproduce:

Load the attached HTML file. The green sticky box is stuck below the scroll clip.
Scroll down to reach it.


Actual results:

As you scroll down the scrollable content length grows infinitely as the sticky box is pushed down so you can never scroll to it.


Expected results:

Chrome and Safari treat the scrolling content size as the containing block size for sticky position computation, which means the sticky position box is clamped by, and not allowed to move below the scrolling content length.

Comment 1

[Mike Taylor [:miketaylr]]

(note, this bug came up in a blink-dev thread about differences between Chrome's implementation and ours: https://groups.google.com/a/chromium.org/d/msg/blink-dev/X_vBQp60kp8/rIdvtOqfCAAJ)

Comment 2

[Boris Zbarsky [:bzbarsky]]

David, who's been tracking the sticky position spec bits?

Comment 3

[Firefox Bug Husbandry Bot]

2019-03-06

This bug is part of a group of bugs which have had an open needinfo for at least 12 weeks.

The request for information has not been answered, and we can't move forward on the bug so we are closing it.

If the defect is still present, please reopen this bug with an updated report.

Comment 4

[jonjohnjohnson]

Defect is still present, I hope [e-mail] and/or [e-mail] can respond here?

Comment 5

[jonjohnjohnson]

Also, quite certain https://bugzilla.mozilla.org/show_bug.cgi?id=1434265 is a dup of this issue.

Comment 6

[Boris Zbarsky [:bzbarsky]]

Fwiw, I think this was resolved incorrectly and the bot that did it is buggy. I filed https://bugzilla.mozilla.org/show_bug.cgi?id=1547598 on that.

Comment 7

[Andy Earnshaw]

Attachment: Another test case

This also occurs even if the sticky element is only partially out of view (e.g. if it is larger than the container). I've added a repro for that case.