[whatwg/dom] "When a DOMTokenList object is created, then: ..." (#666)

https://dom.spec.whatwg.org/commit-snapshots/32efc48fef28c34ed914b60cfb3c29807e617365/#interface-domtokenlist

> When a DOMTokenList object is created, then:​
> 
>     1. Let element be associated element\.
> 
>     2. Let localName be associated attribute’s local name\.
> 
>     3. Let value be the result of getting an attribute given null, localName, and element\.
> 
>     4. Run the attribute change steps for element, localName, value, value, and null\. 

In step 3, "getting an attribute" links to the [get an attribute by namespace and local name](https://dom.spec.whatwg.org/#concept-element-attributes-get-by-namespace) algorithm, which returns an `Attr` node or `null`. This is a problem because in step 4, value is passed to the "attribute change steps" as the oldValue and value arguments, which only accept a `string` or `null`. So, step 3 should either link to the [get an attribute value](https://dom.spec.whatwg.org/#concept-element-attributes-get-value) algorithm or operate on the returned `Attr` node's value. Not really sure which is more appropriate here.

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