17447 2012-06-08 21:50:46 +0000 [Shadow]: What happens when ShadowRoot instantiated from a different context? 2012-11-27 19:11:38 +0000 1 1 1 Unclassified WebAppsWG HISTORICAL - Component Model unspecified PC All RESOLVED DUPLICATE 15611 P2 normal --- 18428 1 dglazkov dglazkov dominicc public-webapps-bugzilla oldest_to_newest 68887 0 dglazkov 2012-06-08 21:50:46 +0000 "Create a new instance of the ShadowRoot object" what if it is a ShadowRoot from a different iframe (different from window of the new host)? Then we'll have to either return a different object from the constructor or do something else. element.createShadowRoot solves this problem, btw. 69176 1 dominicc 2012-06-18 02:39:20 +0000 (In reply to comment #0) > "Create a new instance of the ShadowRoot object" > > what if it is a ShadowRoot from a different iframe (different from window of > the new host)? > > Then we'll have to either return a different object from the constructor or do > something else. What is the particular difficulty here? Isn’t it enough to say Create a new instance of the ShadowRoot object in the ownerDocument of element or something like that? > element.createShadowRoot solves this problem, btw. First, constructors can return different objects, although it is probably preferable not to do that to make extension easier. Assuming new ShadowRoot works like a typical JavaScript constructor (ie it does not return a different object), is the only difference between new ShadowRoot(element) and element.createShadowRoot that the prototype chain of the object created by new ShadowRoot(element) is fixed? I don’t think that is particularly a problem; the object can just use the environment of the page creating the ShadowRoot. If e is an element from a frame f and you do var s = new ShadowRoot(e); this just means that s.constructor === window.ShadowRoot Object.getPrototypeOf(s) === window.ShadowRoot.prototype s.ownerDocument === f.contentWindow.document Admittedly it is weird to mix constructors from one window with content from another, but it works. 78940 2 dglazkov 2012-11-27 19:11:38 +0000 This is no longer an issue, since we switched to use .createShadowRoot in bug 15611 *** This bug has been marked as a duplicate of bug 15611 ***