When using/testing mdc-web on the demo site, there seems to be an issue with the text field.
0.11.1 via this page:
https://material-components-web.appspot.com/
Microsoft Edge 41.16193.1001.0
Windows 10 Build 16193
Open Edge to https://material-components-web.appspot.com/textfield.html and click inside of a text field and start typing.
It behaves normally.
The background turns black.

I have been seeing the same issue in Edge as well. I'm using version 40.15063.0.0
We are using MDC version 0.16 and we still have this problem. Checkboxes & radio buttons got the same problem.
I think it has something to do with the ::after elements that are set.
Any workarounds or solutions?
Running MDC v0.17.0 on Edge 40.15063.0.0. Can reproduce this problem on text fields, checkboxes, radio buttons, and CSS-only tabs.
Same issues over here. MDC components in Edge are very buggy. Hope some bugfixes will resolve this.
We're also seeing the same issue here, for EdgeHTML 15.15.063 / Edge 40.15063.0.0, including radio buttons and checkboxes.
Most helpful comment
Running MDC v0.17.0 on Edge 40.15063.0.0. Can reproduce this problem on text fields, checkboxes, radio buttons, and CSS-only tabs.