Added Area-Polymer, Triaged labels.

Removed Area-Polymer label.
Added Pkg-Polymer, Area-Pkg labels.

This comment was originally written by Roman.Korneyev@gmail.com

the similar bug https://code.google.com/p/dart/issues/detail?id=19561 (!)

This comment was originally written by joo.tsao...@gmail.com

Please fixed the issue, thanks!

Issue #19561 has been merged into this issue.

It seems that this is a restriction from blink's native implementation of shadow-root. I have to investigate more if this is intentional or a bug though.

Here is an example that using Javascript alone. The call to div.createShadowRoot() works fine, but the same call on the select element gives the error above. The error also shows up if I switch to use a textarea element (as in issue #19561).

    <select is="x-a"><option>1</option></select>
    <div is="x-b"><span>2</span></div>
    <script>
      var A = function() {};
      A.prototype = Object.create(HTMLSelectElement.prototype);
      A.extends = 'select';
      document.registerElement('x-a', A);
    
      var B = function() {};
      B.prototype = Object.create(HTMLDivElement.prototype);
      B.extends = 'div';
      document.registerElement('x-b', B);
    
      var div = document.querySelector('div');
      div.createShadowRoot().innerHTML = '[<content></content>]';
    
      var select = document.querySelector('select');
      select.createShadowRoot().innerHTML = '<content></content>';
    </script>

Added this to the 1.6 milestone.
Removed Priority-Unassigned label.
Added Priority-Medium label.

Removed this from the 1.6 milestone.
Added Polymer-P-1 label.

Removed Polymer-P-1 label.
Added Polymer-Milestone-Next label.

Added PolymerMilestone-Next label.

Removed Polymer-Milestone-Next label.

This comment was originally written by kurotensh...@autistici.org

I am the same problem. Not possible to extend img or textarea, which obliges me to create the components from scratch...

I am using Polymer 0.12.0-dev.

It looks like this is the blink bug for this, https://code.google.com/p/chromium/issues/detail?id=234020. Some progress has been made it looks like, but there has not been any activity recently... Also I don't know if other browsers have similar issues or not.

This comment was originally written by joo.tsa...@gmail.com

update to sdk 1.6.0 and polymer 0.13.0+3, this issue is still not resolved.

Sorry @­joo.tsao - unfortunately this looks like a bug all the way in blink/chrome. The link that Jake posted in #­15 will let you know when the issue gets fixed there.

After they fix it, it will take some time until you see it live. In particular, if you are using the beta channel, it normally takes 6 weeks until changes get released there.

This issue has been moved to dart-archive/polymer-dart#190.