getElementsByTagName should return HTMLCollection

TypeScript Version: 2.1.4

Code

const nodeList = document.getElementsByTagName("p");
nodeList instanceof NodeList; // returns false, although lib.d.ts says it returns NodeList

Example: http://codepen.io/DaSch/pen/OWPvZZ

Expected behavior: document.getElementsByTagName(“*”) is defined to return HTMLCollection

Actual behavior: document.getElementsByTagName(“*”) is defined to return NodeList

Spec: https://dom.spec.whatwg.org/#dom-element-getelementsbytagname https://developer.mozilla.org/en-US/docs/Web/API/Element/getElementsByTagName

[HolgerJeromin]

IMO the original request and both issues from @JacksonKearl are solved (at least in TS3.1).

[JacksonKearl]

Also HTMLCollection is typed as having a forEach method but it does not. https://developer.mozilla.org/en-US/docs/Web/API/HTMLCollection