1907805 - arca.live - Does not show preview image when flicking over articles with images

Status: RESOLVED FIXED

(Web Compatibility :: Site Reports, defect, P2)

Description

[Calin Tanase]

Environment:
Operating system: Android
Firefox version: Firefox 128.0/130

Steps to reproduce:

1. Go to https://arca.live/b/zenlesszonezero
2. Scroll down the page.
3. Flick over articles that has the preview/image icon before the title.

Expected Behavior:
The preview image is shown.

Actual Behavior:
The preview image is missing.

Notes:

• Reproduces regardless of the status of ETP
• Reproduces in Firefox Nightly, and Firefox Release
• Does not reproduce in Chrome

Created from https://github.com/webcompat/web-bugs/issues/139023

Comment 1

[Calin Tanase]

Attachment: arca Chrome vs FF.mp4

Comment 2

[James Graham [:jgraham]]

Looks like this is made visible in a :hover rule, including on mobile.

Comment 3

[Daniel Holbert [:dholbert]]

Attachment: testcase 1

Comment 4

[Daniel Holbert [:dholbert]]

It seems like :hover works a bit inconsistently in general on mobile (googling for "Android :hover" turns up a bunch of articles about it not doing what people expect).

Testing in testcase 1 and the original site, it looks like we have some commonality and one minor behavior-difference that I think the screencast is demonstrating

In both Chrome and Firefox, when you touch the screen over a link (as in the case in this bug):
(A) If you move your finger immediately after you touch the screen, :hover state is never activated on the thing that you touched.
(B) If you don't move your finger (i.e. long-press), the :hover state gets activated and a context-menu appears for the link. (These happen at the same time in Firefox, vs. one-after-the-other in Chrome with a short delay between them.)

...BUT:
(C) If you wait a fraction of a second between touching & moving your finger. then Chrome activates the :hover state but does not show the context-menu for the link.

So it seems that in Chrome, adding-the-hover-state is decoupled (and happens slightly sooner) than showing-a-link-context-menu; whereas in Firefox, those two things happen atomically (with the hover state also being shown slightly later than in Chrome).

This probably merits a platform bug to investigate whether there are good reasons to decouple these events in the way that Chrome does; but it doesn't look to me like this really breaks this particular site (or is an intended or particularly-discoverable way of viewing the preview images here); I'd rate this as very low-severity. If you tap-and-hold the preview images, the preview shows up in both Firefox and Chrome (along with a context-menu, since you're long-pressing a link).

Comment 5

[Daniel Holbert [:dholbert]]

(In reply to Daniel Holbert [:dholbert] from comment #4)

This probably merits a platform bug to investigate whether there are good reasons to decouple these events in the way that Chrome does;

Spun off as bug 1919411.