1494132 - Reftest percent-height-overflowing-image-1.html fails on Android (Firefox for Android's overlay scrollbars suggest there's more overflow for "overflow-x:scroll" vs. "overflow:auto", with the same overflowing content)

Status: NEW

(Core :: Layout: Scrolling and Overflow, defect, P5)

Description

[Daniel Holbert [:dholbert]]

Spinning this off for a reftest failure for the reftest I'm adding in bug 1487537, called "percent-height-overflowing-image-1.html".

That reftest's testcase has a scrollable div, with a percent-sized image inside of it.  In the part of the reftest that fails (the second row), the image is *barely* wider than the container - so it's expected to trigger a horizontal scrollbar to show up.

In the reftest failure screenshots, it looks like the scrollbar is a different length between the testcase vs. the reference case, which indicates that there's a different amount of overflow.  I don't immediately see why this should be the case; hence, filing this bug and using it in a "fails-if(Android)" annotation.

Comment 1

[Daniel Holbert [:dholbert]]

Attachment: reftest log, showing the failure

Here's a reftest log snippet showing the test failure on Android.

(This is from a try run, before I added the fails-if(Android) annotation.)

Comment 2

[Daniel Holbert [:dholbert]]

...and the reftest itself (just landed) is:
https://hg.mozilla.org/integration/mozilla-inbound/file/tip/layout/reftests/scrolling/percent-height-overflowing-image-1.html
https://hg.mozilla.org/integration/mozilla-inbound/file/tip/layout/reftests/scrolling/percent-height-overflowing-image-1-ref.html