[whatwg/dom] Handle attribute changes after changing attribute (PR #1176)

At least in chromium, synchronous internal listeners for attribute changes which are run as "attribute change steps" are run after the attribute is actually changed, not before.

This affects popover attribute related algorithms in HTML: https://github.com/whatwg/html/pull/9048#discussion_r1141122175

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1176

-- Commit Summary --

  * Handle attribute changes after changing attribute

-- File Changes --

    M dom.bs (4)

-- Patch Links --

https://github.com/whatwg/dom/pull/1176.patch
https://github.com/whatwg/dom/pull/1176.diff

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