HTMLObjectElement has alt attribute only in Internet Explorer (and edge?) #21386
Description
TypeScript Version: 2.6.3
lib.dom.d.ts has alt attribute for HTMLObjectElement:
https://github.com/Microsoft/TypeScript/blob/5b5a00745997768fad7d3a4c98931af179fa277a/lib/lib.dom.d.ts#L5981-L5986
This is not in HTML Standard, Firefox or Chrome available.