This is rather a feature request, you might want to polyfill Custom Elements only adding a script that points to the CDN:
<script
src="//cdnjs.cloudflare.com/ajax/libs/document-register-element/0.1.6/document-register-element.js"
>/* W3C Custom Elements */</script>
in this way you could drop the message about using using Chrome and help such polyfill to improve in case something does not work.
Please note that is not Polymer: it polyfills Custom Elements only and nothing else, also without adding globals partial shims as WeakMap is, as example, in Polymer case.
This is rather a feature request, you might want to polyfill Custom Elements only adding a script that points to the CDN:
in this way you could drop the message about using using Chrome and help such polyfill to improve in case something does not work.
Please note that is not Polymer: it polyfills Custom Elements only and nothing else, also without adding globals partial shims as WeakMap is, as example, in Polymer case.