[whatwg/dom] Shadow: define attachShadow() for custom elements (#223)

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

  https://github.com/whatwg/dom/pull/223

-- Commit Summary --

  * Shadow: define attachShadow() for custom elements

-- File Changes --

    M dom.bs (8)
    M dom.html (4)

-- Patch Links --

https://github.com/whatwg/dom/pull/223.patch
https://github.com/whatwg/dom/pull/223.diff

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