RESOLVED WONTFIX 102864
elements APPLET,FIELDSET,FRAME,IFRAME,IMG,INPUT,OBJECT,SELECT,TEXTAREA are not able to host shadow tree 
https://bugs.webkit.org/show_bug.cgi?id=102864
Summary elements APPLET,FIELDSET,FRAME,IFRAME,IMG,INPUT,OBJECT,SELECT,TEXTAREA are no...
Aleksei Yu. Semenov
Reported 2012-11-20 20:13:15 PST
The specification http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html reads: "The shadow DOM allows multiple DOM trees (in addition to the document tree) to be composed into one larger tree when rendered. The existence of multiple DOM trees is enabled by letting any element in the document tree to host one or more additional DOM trees." However elements APPLET,FIELDSET,FRAME,IFRAME,IMG,INPUT,OBJECT,SELECT,TEXTAREA are not able to host shadow tree. Found in Chrome version 23.0.1271.64 m Example code: <html> <head> <script type="text/javascript"> function A_04_00_01_test(elementName) { var d = document; var SR = window.ShadowRoot || window.WebKitShadowRoot; // create element var n = d.createElement(elementName); d.body.appendChild(n); try { var shadowTree1 = new SR(n); d.write("<P>"+elementName+": OK"); } catch(e) { d.write("<P>"+elementName+": " + e.name + e.message); } } function test() { // uncomment the line you need A_04_00_01_test('APPLET'); A_04_00_01_test('FIELDSET'); A_04_00_01_test('FRAME'); A_04_00_01_test('IFRAME'); A_04_00_01_test('IMG'); A_04_00_01_test('INPUT'); A_04_00_01_test('OBJECT'); A_04_00_01_test('SELECT'); A_04_00_01_test('TEXTAREA'); } </script> </head> <body onload="test()"> </body> </html>
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Sergey G. Grekhov
Comment 1 2012-12-11 01:45:40 PST
The list from the description is not complete. 'embed', 'video', 'audio', 'canvas', 'progress' and 'meter' cannot be made a Shadow root as well
Simon Pieters (:zcorpan)
Comment 2 2018-08-15 01:05:41 PDT
https://dom.spec.whatwg.org/#dom-element-attachshadow says which elements are allowed to be shadow root in shadow DOM v1. I think this bug can thus be closed.
Ryosuke Niwa
Comment 3 2019-10-04 22:21:52 PDT
We decided explicitly to not support this in V1 API.
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