[Webkit-unassigned] [Bug 153056] New: position:fixed is incorrectly positioned when tab bar is visible on iPhone 6S+ Safari
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Tue Jan 12 21:53:40 PST 2016
https://bugs.webkit.org/show_bug.cgi?id=153056
Bug ID: 153056
Summary: position:fixed is incorrectly positioned when tab bar
is visible on iPhone 6S+ Safari
Classification: Unclassified
Product: WebKit
Version: Safari 9
Hardware: iOS
OS: iOS 9.0
Status: NEW
Severity: Normal
Priority: P2
Component: CSS
Assignee: webkit-unassigned at lists.webkit.org
Reporter: webkit at chrisrebert.com
Created attachment 268854
--> https://bugs.webkit.org/attachment.cgi?id=268854&action=review
GIF video demonstrating the bug
Original Bootstrap bug report: https://github.com/twbs/bootstrap/issues/18859
iOS version: 9.2
Hardware: iPhone 6S Plus
Device orientation: Landscape
Steps to reproduce:
1. Open Safari
2. Rotate the screen so it's in Landscape orientation
3. Navigate to a webpage
4. Open a new tab
5. Navigate to http://getbootstrap.com/javascript/#modals-sizes
6. Ensure that Safari's tabs bar is visible. (If it's not, scroll down and then up so it becomes visible.)
7. Tap either the "Large modal" or "Small modal" button
Expected result:
The position:fixed Bootstrap modal element should be visible and positioned within the bounds of the visual viewport
Actual result:
The position:fixed Bootstrap modal element isn't visible.
To bring it into view, you must scroll the page down (and thus cause the tabs bar to hide).
Additional notes:
This bug only occurs when Safari's tabs bar is visible.
(And thus it never occurs when in Portrait orientation.)
If you hide the tabs bar (by scrolling down) before tapping the button, this bug doesn't occur.
If the device is in Landscape orientation but has no other tabs open, this bug doesn't occur.
This bug doesn't occur in OS X Safari 9.0.2.
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