1713859 - Elastic overscroll from a static position in macOS should be deeper

Status: RESOLVED DUPLICATE of bug 1710246

(Core :: Panning and Zooming, enhancement)

Description

[Martín González Gómez]

Attachment: firefox_safari_overscroll.mp4

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:89.0) Gecko/20100101 Firefox/89.0

Steps to reproduce:

Scroll in any page

Actual results:

Elastic overscroll works but the effect is less deep than in Safari

Expected results:

Elastic overscroll works but the effect is as deep than Safari.

A rough calculation in my 1680x1050 M1 MBP gives me ~25px of elastic overscroll in Firefox 89 and ~80px in Safari.

Comment 1

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

The Bugbug bot thinks this bug should belong to the 'Core::Panning and Zooming' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 2

[Timothy Nikkel (:tnikkel)]

Looks like you are testing the static situation. How do you feel about overscroll when you are scrolling in a direction that is scrollable but then reach the end (or start) of the page?

Comment 3

[Martín González Gómez]

Good catch. The overscroll that happens whilst you're scrolling down or up looks right, it is deep and to the same amount as Safari. The improvement opportunity is when you're scrolling from a static position.

Comment 4

[Botond Ballo [:botond]]

I think this is substantially a duplicate of bug 1710246. (The title of that one says "when you repeat in the same direction", but the behaviour is the same as "from a static position", i.e. cases where the position samples used to determine the starting velocity of the snap-back animation come from when the page is overscrolled rather than when the page is scrolling normally.)