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The concept of tree IDs isn't actually serving any purpose so far. It's just something I copied from Chromium. The Windows platform adapter doesn't do anything with it, and neither will any of the other platform adapters I plan to implement in the foreseeable future. I don't plan to actually implement support for child trees anytime soon. So to reduce clutter, and hopefully encourage actual adoption of AccessKit by GUI toolkits, I'm dropping this.