[whatwg/dom] Add `class` as an alias for `className` (Issue #1310)

### What is the issue with the DOM Standard?

Currently, to access the `class` attribute of an element in Javascript, you need to use `element.className` instead of just `element.class`.
This is unintuitive and inconsistent with other attributes, and there is little reason for it because `class` is no longer a reserved word.

Note:
This is just to mirror [issue #9379](https://github.com/whatwg/html/issues/9379) in the HTML repo.
The reception has been rather positive over there, it seems like this is only missing interest from implementers.

(I have a working build of Firefox that implements this and am working on one for Chrome, I am now just opening the required issues and PRs to make this happen.)

-- 
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/dom/issues/1310
You are receiving this because you are subscribed to this thread.

Message ID: <whatwg/dom/issues/1310@github.com>