Bug 83974 – scrollTop value for body element always 0 if height is set

• Status: RESOLVED
• Resolution: WONTFIX
• Component: DOM

[Caleb Troughton]

I've attached a couple reduced test cases. In the failing test case the html element has overflow-x:hidden and the body has a height of 100%. Regardless of scroll position, body reports a scrollTop of 0 at all times.  Removing either the overflow-x hidden on html or the height on body result in the body element reporting scrollTop correctly, as can be seeing in the working case.

To reproduce:
1. Open failing-case attachment.
2. Scroll down any amount and click the Report scrollTop Values button.
3. Compare the results to the same steps using working-case attachment.

[Caleb Troughton]

Created attachment 137201 [details]
Failing test case

[Caleb Troughton]

Created attachment 137202 [details]
Working test case by removing height declaration from body element.

[j.j.]

seems a duplicate of bug 106133, see also bug 5991 comment 11

[Ahmad Saleem]

RESULTS from "Failing test case" across all browsers:

*** Safari 15.6 on macOS 12.5 ***

BODY scrollTop: 0
HTML scrollTop: 0

*** Firefox Nightly 105 ***

BODY scrollTop: 0
HTML scrollTop: 0

*** Chrome Canary 106 ***

BODY scrollTop: 0
HTML scrollTop: 0

RESULTS from "Working test case..." across all browsers:

*** Safari 15.6 on macOS 12.5 ***

BODY scrollTop: 0
HTML scrollTop: 0

*** Firefox Nightly 105 ***

BODY scrollTop: 0
HTML scrollTop: 0

*** Chrome Canary 106 ***

BODY scrollTop: 0
HTML scrollTop: 0

________

I am not sure whether spec changed or what but all browsers are not following web-spec but I am not able to reproduce and get same results across all browsers. As a result, I am going to mark this as "RESOLVED WONTFIX". Please reopen, if you think above results are wrong or I tested something incorrectly. Thanks!