1602021 - Moving a hidden absolutly positioned element gives different position vs. moved when not hidden

Status: NEW

(Core :: Layout, defect, P3)

Description

[Nicholas Shanks]

Attachment: missing-left-zero-behaviour.html

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:69.0) Gecko/20100101 Firefox/69.0

Steps to reproduce:

Moved a hidden, absolutly positioned element in the DOM.

Actual results:

It ended up in the wrong place on screen when unhidden.
Moving it without hiding it first results in it being in the expected place.

Expected results:

Resultant position should not depend on display: none

Comment 1

[Gyula Palko[:gpalko]]

I'm setting the component in order to involve the development team to review this issue. Thanks!

Comment 2

[Jeronimo Torti (Please send NI request to Brindusa Tot)]

Hi,
thanks for the details. I was able to reproduce on Windows 10, MacOS 10.14.5 and Ubuntu 18.04.3 LTS on Firefox 71, 72 and Nightly version 73.0a1 (2019-12-12) (64-bit).

Component was set in previous review.

Regards,
Jerónimo.

Comment 3

[Henri Sivonen (:hsivonen)]

Confirming in the sense that the behavior differs from Safari. Over to layout to decide which engine has a bug.

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

The priority flag is not set for this bug.
:djg, could you have a look please?

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