Open Bug 1351080 Opened 5 years ago Updated 4 years ago

[e10s] <select> drop-down doesn't appear near <select> if CSS 'transform' is applied to iframe


(Core :: Layout: Form Controls, defect, P3)

52 Branch




(Reporter: 684sigma, Unassigned)


(Blocks 1 open bug)


(Keywords: regression, testcase)


(2 files)

I have a problem with Firefox Beta 52. It also happens in Beta 53, Nightly 55. Doesn't happen in ESR 45. (Well, I remember that it happened in some other cases, but in this exact case there's no bug in ESR 45. I'm not sure whether this is considered as regression)
Sometimes drop-down list of <select> options appears far away from <select> if CSS 'transform' is applied.
Here's how to reproduce it:

1. Open attached document
2. Click on <select>

Result: drop-down appears in a distance
Expected: drop-down list should be exactly below the <select>

I've added "[e10s]" in the summary, because it isn't reproducible if in Nightlly I disable multiprocess.
Please correct me if this logic is incorrect.
Has STR: --- → yes
Keywords: regression
* not sure
Keywords: regression
See Also: → 1351081
Blocks: e10s-select
Ever confirmed: true
Keywords: regression, testcase
OS: Unspecified → All
Hardware: Unspecified → All
NG on Windows and GNU/Linux build but works on macOS.
Nothing shows up on Edge and Chrome when loading test case in this bug.
Priority: -- → P3
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