Re: [w3c/webcomponents] observedStyles (#856)

Let's try to make it easier than, you don't need the old value of the style, a custom element should already know its own state (vertical, horizontal), can this be applied only to custom css properties, can a callback be fired whenever any style changes without telling me what has changed, we just need to know that something happened then we can check the computedStyle on whatever property we care about, something like that.

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