# Aurelia-web-components plugin testing

**URL:** <https://discourse.aurelia.io/t/aurelia-web-components-plugin-testing/1096>\
**Category:** Help Requests\
**Created:** [April 18, 2018, 6:10pm UTC](https://discourse.aurelia.io/t/aurelia-web-components-plugin-testing/1096 "2018-04-18T18:10:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![constructor](https://yyz1.discourse-cdn.com/flex027/user_avatar/discourse.aurelia.io/constructor/32/710_2.png) [@constructor](https://discourse.aurelia.io/u/constructor)\
**Post date:** [April 18, 2018, 6:10pm UTC](https://discourse.aurelia.io/t/aurelia-web-components-plugin-testing/1096/1 "2018-04-18T18:10:55Z")

</div>

I am attempting to test: [https://github.com/aurelia/web-components](http://aurelia-web-components) using:

Operating System: Windows 10  
Node Version: v8.10.0  
NPM Version: 5.8.0  
Browser: Version 66.0.3359.117 (Official Build) (64-bit)  
Browser: Version 68.0.3399.0 (Official Build) canary (64-bit)

Code is here:  
[https://github.com/constructor/aurelia-plugin-tests/tree/testing/aurelia-web-components](https://github.com/constructor/aurelia-plugin-tests/tree/testing/aurelia-web-components)

I am getting error:  
Unhandled rejection TypeError: Cannot read property ‘isInitialized’ of undefined.

Note from [https://github.com/aurelia/web-components:](https://github.com/aurelia/web-components:) This plugin requires that your browser have native support for the CustomElements v1 spec or that you have configured a v1 spec-compliant polyfill prior to calling registry methods.

[Custom Elements v1 is 100% in Chrome versions \> 67](https://caniuse.com/#search=Custom%20Elements).

I get the same error in both listed browsers. Anyone point me in the right direction?