[whatwg/dom] "Use these attribute change steps to update an element's ID" (#628)

https://dom.spec.whatwg.org/commit-snapshots/4c95d89624f695e9d74fd545b004ae85ca3cd6b6/#example-c5b21302

> Use these attribute change steps to update an element’s ID:​ 

Why not just say that an element's ID is null, if it has no id attribute or its ID attribute is the empty string, and the value of the ID attribute otherwise? Why use the attribute change steps here?

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