Open Bug 1351062 Opened 7 years ago Updated 2 years ago

[e10s] mouse movements are captured in a wrong way if CSS 'transform' changes in iframe


(Core :: Layout, defect, P3)

52 Branch



Tracking Status
firefox52 --- wontfix
firefox53 --- wontfix
firefox54 --- fix-optional
firefox55 --- wontfix
firefox56 --- wontfix
firefox57 --- wontfix
firefox58 --- affected


(Reporter: 684sigma, Unassigned)




(2 files, 1 obsolete file)

I have a problem with Firefox Beta 52. It also happens in Beta 53, Nightly 55. Doesn't happen in ESR 45.
On some sites I noticed a very weird behavior: mouse movements are captured incorrectly, as if mouse cursor was placed in a different area. I experimented a bit, and created a working example of the bug.
I'll check those sites once this bug is fixed. Here's how to reproduce the bug:

1. Open attached page
2. Click on the button, then immediately move mouse over iframe
3. Keep moving mouse up and down within iframe and right-clicking, but don't click on buttons.

Result: buttons become hovered far away from mouse cursor; context menu appears far away from mouse cursor.
Expected: normal behavior.

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.
See Also: → 1351063
Has STR: --- → yes
Keywords: regression
Another bug detected with that page is bug 1351063.
I found a regression range in FF42:

I think it's a side-effect of bug 1172239 with e10s enabled.
I'm hoping this is more of a Layout thing :)
Component: Event Handling → Layout
Too late for a fix for 53, fix-optional for 54, minor carryover regression.
Ever confirmed: true
Blocks: 1172239
Priority: -- → P3
Flags: needinfo?(aschen)
Astley, should this be fix-optional for 57?
Flags: needinfo?(bmo)
Attached file iframe.html
Extracted iframe content to a separate HTML file.
Refresh the test case as iframe with src attribute in data URI format will be taken as unique, opaque origins. See bug 1324406.
Attachment #8851747 - Attachment is obsolete: true
Keywords: regression
See Also: → 1548560
Severity: normal → S3
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