102381 2012-11-15 06:48:15 -0800 background-attachment:fixed changes position when flash object is below it. 2013-06-15 13:04:05 -0700 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) Mac (Intel) OS X 10.8 RESOLVED DUPLICATE 65793 http://jsfiddle.net/honk1/jAJfc/1/ P2 Normal --- 1 jens webkit-unassigned bdakin caseyleask jens simon.fraser oldest_to_newest 768020 0 jens 2012-11-15 06:48:15 -0800 here is a fiddle: http://jsfiddle.net/honk1/jAJfc/1/ its a large scale background image and a fixed header. header and background have the same background image. header has fixed position to be visible during scrolling, so the header may cover the site content that scrolls below it. when the user scrolls and the content has a flash object in it, and it "hits" the header, the image inside the header gets repositioned / jumps to a weird position. in the nightly build its even worth, i think the background-attachment: fixed; attribute isnt set yet..? i mean: its not working in the first place. 768029 1 jens 2012-11-15 06:56:49 -0800 of course, if no flash object is inside the content, the behaviour is as desired. same with mozilla/ie browsers. 768067 2 jens 2012-11-15 07:47:53 -0800 this also happens on the ipad, where no flash element is placed, but a video element. the jsfiddle is a static html source code from a rendered site. the code gets generated by the longtail jwplayer and should be fine. on mobile devices the player generates a html5 video element. if the video element hits the header, its background image moves, or whatever happens there.. 769608 3 simon.fraser 2012-11-16 13:09:28 -0800 Seems like the background origin is being incorrectly computed when we render into a composited layer. 794061 4 caseyleask 2012-12-18 14:33:03 -0800 I've got a similar problem with background-attachment: fixed and loading assets. Set plugins in Chrome to 'Click to Play'. Visit this fiddle. http://jsfiddle.net/CaseyLeask/3s2GE/ scroll the page, with the background working correctly. Load the Flash Player instance. Scroll the page again. 794065 5 caseyleask 2012-12-18 14:34:19 -0800 Afterwards, highlight the text for dramatic effect. 900798 6 simon.fraser 2013-06-15 13:04:05 -0700 *** This bug has been marked as a duplicate of bug 65793 ***