1691806 - pinch zoom in/out triggers scrolling on the google map like content in https://www.vrt.be/vrtnws/nl/2020/07/24/aantal-nieuwe-coronabesmettingen-per-gemeente/

Status: NEW

(Core :: Panning and Zooming, defect, P3)

Description

[Kevin Brosnan [Ex-Mozilla]]

From github: https://github.com/mozilla-mobile/fenix/issues/17936.

Eg. https://www.vrt.be/vrtnws/nl/2020/07/24/aantal-nieuwe-coronabesmettingen-per-gemeente/ doesn't work.

Pinch will sometimes zoom, however trying to scroll just scrolls the page.

This issue is not reproducible in Chrome.

I have version 85.1.2 (Build #2015791451)

Change performed by the Move to Bugzilla add-on.

Comment 1

[Hiroyuki Ikezoe (:hiro)]

Kevin, can you elaborate what "should be able to be captured by the webpage" means? The site has a map which seems to be capturing tap events but other place seems not be capturing events at all. And I don't see significant difference on Chrome.

Comment 2

[Kevin Brosnan [Ex-Mozilla]]

Chrome seems to be able to detect if the user is sending and the page is consuming multiple touch points. This allows the page not to scroll when pinch zooming or two finger pan on maps. However other pages and parts of that page that are not the map are able to be scrolled by two+ fingers.

The two touch point requirement is common design when placing a map on the screen on mobile. It stops the case where the map is scrollable by a single touch. When maps consumed the single touch point that can prevent access to parts of the websites because the user cannot scroll past the map.

Comment 3

[Hiroyuki Ikezoe (:hiro)]

Thank you Kevin. It's hard to tell whether this is an issue inside gecko or the site in question is doing differently for Chrome or a webcompat issue.

Comment 4

[Botond Ballo [:botond]]

Marking as S3 as a bug which is known to affect a specific website and we're not aware of other user reports about it.

Comment 5

[Hiroyuki Ikezoe (:hiro)]

Note that I tested on a page where a google map is embeded and Google Map handles two fingers pan gesture properly on the map, i.e. it scrolls the map rather than the content document.