Bug 125133

Summary: [Coordinated Graphics] An element with background-size:cover is drawn incorrectly under certain condition.
Product: WebKit Reporter: Jeong Jin Gyeong <jjgjoojis>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: dtrebbien, jaepark, nick.diego, noam, yoon
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: PC   
OS: Linux   
URL: http://black.company100.com/test/background-size-cover/

Jeong Jin Gyeong
Reported 2013-12-02 22:43:20 PST
It is appeared in EFL. I checked at r159833. Test: http://black.company100.com/test/background-size-cover/ The color of rightmost pixel is expected to be cyan. Google Chrome 27 works correctly. EFL MiniBrowser displays black pixel at rightmost. I found 2 reappearance conditions. The gap is appeared if at least one of the conditions is true. 1. Set position style of the element to fixed { position: fixed; } 2. Make the element an AC layer. { -webkit-transform: translateZ(0); } The above test applies 2nd condition only. ( position: absolute, -webkit-transform: translateZ(0). )
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