By Russ Weakley:
How does the Shadow DOM appear in the accessibility tree?
Browsers flatten the shadow tree when building the accessibility tree. Flattening removes the accessibility boundary of the shadow root and exposes the internal nodes as if they were normal children in the accessibility tree, not the DOM tree.
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How does the Shadow DOM appear in the accessibility tree? - Max Design
Learn how browsers build accessible names using the idea of an accumulated text bucket, and why some naming rules empty and replace itwww.maxdesign.com.au