Re: [dom] Added an example showing feature detection with supports() (#144)

I wonder what the added value of that example would be. The point of the example from my perspective is to show developers how to use the feature for feature detection, which realistically means that they would need to detect support for `supports()` as well as the existence of the DOMTokenList their trying to test on. Otherwise the example is trivial.

Maybe we should just make sure that realistic examples are available in the realm of blog posts/explainers and leave it out of the spec?

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