Tested on Microsoft Edge from Windows 10 build 10240. Fixed in build 10586.

Synopsis

Running XMLDocument.prototype.evaluate on a document that has namespaceURI set to null crashes the current tab process in Microsoft Edge, leaves the developer tools for that tab unresponsive, sends debug information to watson.telemetry.microsoft.com , and force-reloads the page.

Repro

To reproduce, open any website in Microsoft Edge, hit F12 to open developer tools, select Console, and run these 3 lines of javascript: