1347998 - Align DOMTokenList with the DOM Standard

Status: RESOLVED DUPLICATE of bug 869788

(Core :: DOM: Core & HTML, enhancement, P2)

Description

[Anne (:annevk)]

Tests:

  http://w3c-test.org/dom/nodes/Element-classlist.html
  http://w3c-test.org/dom/lists/

Comment 1

[Boris Zbarsky [:bzbarsky]]

It looks per those tests the DOMTokenList can't just be built directly on top of our attribute value, because the former doesn't have duplicates but the latter does.  In particular, computing its length is actually a potentially expensive operation in the spec, unlike what we have right now.  :(

Comment 2

[Aryeh Gregor (:ayg) (no longer with Mozilla)]

Reference: https://github.com/whatwg/dom/issues/105

Anne, why is this not a duplicate of bug 869788?  It looks like the spec requires that all operations get rid of duplicates/whitespace, which seems exactly the same as bug 869788?

Comment 3

[Aryeh Gregor (:ayg) (no longer with Mozilla)]

Okay, so stringification does not get rid of duplicates/whitespace, that's what's different.  Is that all?  It's still basically the same change as bug 869788, it just needs tweaking.

Comment 4

[Anne (:annevk)]

I think that's all yes. I could probably have refocused that bug instead. Do you want me to reopen it and add comment 0 there?

Comment 5

[Aryeh Gregor (:ayg) (no longer with Mozilla)]

I'll do that, yes, since there was a whole bunch of technical work that already went on in that bug.