`lib.dom.ts` incorrect return type for `Document.elementFromPoint`

[sccolbert]

According to:
https://drafts.csswg.org/cssom-view/#dom-document-elementfrompoint

Document.elementFromPoint should return Element | null. It currently returns Element.

[mhegazy]

Seems fixed in latest.

[sccolbert]

Not fixed in master:
https://github.com/Microsoft/TypeScript/blob/master/lib/lib.dom.d.ts#L3356

[mhegazy]

Sorry about that.

[saschanaz]

Has been fixed now.