1501774 - click event not firing when element gets `will-change: transform` (frame reconstruct) between mousedown and mouseup

Status: RESOLVED DUPLICATE of bug 1497524

(Core :: Layout, defect, P3)

Description

[myfrom.13th]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36

Steps to reproduce:

This bug appears to be related to specific markups and styles combinations.

I'm able to reproduce with an element that is absolutely positioned within its parent and has a ::before pseudo-element with a letter as content.
I know it also happens with web component paper-input (https://www.webcomponents.org/element/@polymer/paper-input)

In those cases, if you add two listeners to the parent of aforementioned element:
 1) `mousedown` in which you add `will-change: transform;` to parent and 
 2) `mouseup` in which you remove the style from the element,
after clicking in my case on the ::before pseudo-element's content (letter "X" in demo), the click event for the element (not parent, element) will not fire; in paper-input case, clicking the input field will not focus it. Clicking on padding, margin or border of the element, or outside ::before does work properly.

Demo: https://jsfiddle.net/myfrom/e5Lvukqn/3/

Sorry for so much complication but I wasn't able to reproduce it with simpler markup/styles.


Actual results:

Click event wasn't fired


Expected results:

Click event is fired just as with clicks outside ::before but still inside the element

Comment 1

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

I wonder if bug 1089326 actually fixes this.

Comment 2

[Xidorn Quan [:xidorn] UTC+10]

Adding "will-change: transform" to an element with abs-pos (or fixed-pos) children would trigger reframe on it, which may mean that the pseudo-element is reconstructed (IIRC?). Not sure what's the best way to handle this case, nor whether it's Layout or DOM should be responsible...

Comment 3

[Emilio Cobos Álvarez (:emilio)]

I'm moderately sure this is a dupe of bug 1497524.

Comment 4

[Emilio Cobos Álvarez (:emilio)]

Attachment: Reduced testcase.

Should log `click` when clicking on the 'X', but that's not the case.

Comment 5

[Emilio Cobos Álvarez (:emilio)]

I