[whatwg/dom] Add before removing steps (PR #1185)

The existing "removing steps" allow other specs to run algorithms after a node has been removed from the tree, but there is no way to run steps before a node has been removed from the tree.

This patch adds new "before removing steps" to allow other specs to run algorithms before the node has been removed.

This is needed for this HTML issue:
https://github.com/whatwg/html/issues/9161

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

  https://github.com/whatwg/dom/pull/1185

-- Commit Summary --

  * Add before removing steps

-- File Changes --

    M dom.bs (15)

-- Patch Links --

https://github.com/whatwg/dom/pull/1185.patch
https://github.com/whatwg/dom/pull/1185.diff

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