Trix doesn't work in IE11 if I use standard polyfills for working with web-components. I would like to do this, so that I can use other web-components in IE11 alongside trix.

I have used the following polyfills:

• https://polyfill.io/v3/polyfill.js?flags=gated&features=Reflect.construct
• https://unpkg.com/@webcomponents/webcomponentsjs/webcomponents-loader.js

I've tried both trix-core.js and trix.js

I've made an example here

I've found that it did work before this commit

Steps to Reproduce

1. Open https://ie11-trix.glitch.me/ in IE 11
2. Open the console
3. See the error: "Error: The custom element being constructed was not registered with customElements."

Details

• Trix version: 1.2.0
• Browser name and version: IE11
• Operating system: Windows 10