runkit: ReferenceError: HTMLElement is not defined in webcomponent 1.2.2

https://npm.runkit.com/webcomponent
Are you aware that runkit is having an issue with webcomponent?

ReferenceError: HTMLElement is not defined

var webcomponent = require("webcomponent")

// a language issue: https://phabricator.babeljs.io/T1548
if (typeof HTMLElement !== 'function') {
var _HTMLElement = function _HTMLElement() {};
_HTMLElement.prototype = HTMLElement.prototype;
HTMLElement = _HTMLElement;
}