[whatwg/dom] Create an abstraction for Element's textContent getter (#743)

This is needed for defining HTML's output element. See https://github.com/whatwg/html/issues/4163 for context.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/743

-- Commit Summary --

  * Create an abstraction for Element's textContent getter

-- File Changes --

    M dom.bs (18)

-- Patch Links --

https://github.com/whatwg/dom/pull/743.patch
https://github.com/whatwg/dom/pull/743.diff

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