[whatwg/dom] concept-node-equals definition is not correct (Issue #1443)

abacabadabacaba created an issue (whatwg/dom#1443)

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

In https://dom.spec.whatwg.org/#concept-node-equals, there is the following line:

> If A is an [element](https://dom.spec.whatwg.org/#concept-element), each [attribute](https://dom.spec.whatwg.org/#concept-attribute) in its [attribute list](https://dom.spec.whatwg.org/#concept-element-attribute) has an [attribute](https://dom.spec.whatwg.org/#concept-attribute) that [equals](https://dom.spec.whatwg.org/#concept-node-equals) an [attribute](https://dom.spec.whatwg.org/#concept-attribute) in B’s [attribute list](https://dom.spec.whatwg.org/#concept-element-attribute).

Not only is the formulation a bit awkward ("each attribute has an attribute" – what does it mean?), it only asserts that the set of A's attributes is a subset of B's attributes. It also needs to state that for each B's attribute, there is an equal A's attribute, or that there is a one-to-one correspondence between the attributes.

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