1834184 - scale inconsistent in full screen

Status: UNCONFIRMED

(Firefox for Android :: Browser Engine, defect)

Description

[djdisodo]

Attachment: with_meta.html

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/114.0

Steps to reproduce:

turn website full-screen

Actual results:

elements are scaled different than before full-screen

Expected results:

elements are scaled same as before full-screen

Comment 1

[djdisodo]

Attachment: without_meta.html

Comment 2

[djdisodo]

i think this is what causing youtube desktop-mode full-screen go wrong
i don't remember since when but i think it was fine for a while after moving onto fenix

without_meta.html is a file with no <meta name="viewport" content="width=device-width, initial-scale=1.0"> line
it get's bigger when you get into full-screen
and full-screen scaling doesn't care about weather it is desktop mode or not

Comment 3

[djdisodo]

Attachment: result.png

with_meta.html
ordered in mobile, mobile_full, desktop, desktop_full

Comment 4

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

The severity field is not set for this bug.
:jonalmeida, could you have a look please?

For more information, please visit BugBot documentation.

Comment 5

[djdisodo]

scale changes when web page is in full screen
and it's same on desktop mode too

this breakes some webpages that use full screen
for example, youtube desktop ui
since youtube desktop ui doesn't work well on small screens
smaller scale is essential and desktop mode makes scale smaller
however this "desktop mode scale" isn't being applied to full screen
which makes youtube desktop mode full screen player unusable due to it's big ui

i'm not sure how should i descibe this behavior