1649837 - pageYOffset and viewport height styling issues

Status: RESOLVED WORKSFORME

(Firefox for Android :: Toolbar, defect)

Description

[jonohewitt]

Attachment: topbottom.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Firefox/78.0

Steps to reproduce:

Visit example site: https://jonohewitt.github.io/pixel-scroller/ with Firefox Nightly 200630 06:01, version 79.0a1

Scroll down the page and back up.

Actual results:

window.pageYOffset is giving values >1 when scrolling back to the very top of the page. Maybe related to the very thin white line at the top of the window that appears immediately on scroll?

Also, if you scroll down to the bottom of the page, the 100vh CSS styling for the bottom pink section is not taking up the whole window height. It has a section of blue at the top.

Expected results:

window.pageYOffset should be giving a 0 value when scrolled back to the very top.

The bottom section should fill the window with pink.

Comment 1

[Kevin Brosnan [Ex-Mozilla]]

Can reproduce on Reference Browser. Cannot reproduce on Geckoview Sample browser so this is an Android components bug. Opened https://github.com/mozilla-mobile/android-components/issues/7585

Comment 3

[Kevin Brosnan [Ex-Mozilla]]

Looks to be works for me on v110 and nightly v112.