Hi, For shadow DOMs which has multiple focusable fields under the host, the current behavior of tab navigation order gets somewhat weird when you want to specify tabindex explicitly.
This is the doc to introduce a new attribute "delegatesFocus" to resolve the issue. https://docs.google.com/document/d/1k93Ez6yNSyWQDtGjdJJqTBPmljk9l2WS3JTe5OHHB50/edit?usp=sharing Any comments are welcome! -- Takayoshi Kochi
