Sometimes MS Edge fails to parse JS files throwing NotSupportedError. And this can be reproduced with Web Components JS file (`webcomponents.js`) file. People have investiged the issue, and according to this, Updating Windows 10 with this update seems to fix it.
You can see the error screenshot here by @warpech.
Reproducing fiddle also by @warpech: https://jsfiddle.net/warpech/gpw2ksdh/