[Webkit-unassigned] [Bug 103757] background-position sometimes doesn't work properly with background-attachment: fixed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103757

John Lascurettes <lascurettes at mac.com> changed:

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--- Comment #5 from John Lascurettes <lascurettes at mac.com> ---
I came to report the same or similar bug with WebKit on Safari (as seen on Yosemite 10.10.2 and Safari  8.0.4 (10600.4.10.7)). Here is a link to a test case that demonstrates where the combo of background-position and background-attachment: fixed does not work as experienced in any other browser that supports those CSS properties. 

http://emological.com/box/bgtest/

In the test, the grass of the HTML background (html.png) should be positioned 0, 100%, or flush with the bottom of the browser's viewport, but actually is pushed mostly off the bottom edge of the viewport. 

Interesting notes: 
- Setting no explicit height, or a height:100% on the HTML element displays the same bug
- Setting height: 100vh; results in the desired behavior that other browsers display.

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