Created attachment 157255 [details] Reduction producing incorrect rendering + the expected rendering A shadow root is incorrectly rendered in the following construction: 1. make an element and insert it into dom. 2. create a shadow root that contains a style element. 3. make another element and insert it into dom. 4. create a shadow root on this element that contains a style element. 5. create another shadow root on the element. The rendering of the 2nd element is incorrect. For this element it's expected that the 2nd shadow root will replace the first; however, it's rendered in addition to the first.
Created attachment 157917 [details] Screenshot of rendering of attachment 157255 [details] Looks like it is working to me. See attached screenshot – this is the output I get with the attached repro. I’m using Chrome 23.0.1232.0 (Official Build 150984) canary OS Mac OS X WebKit 537.6 (@125227)