[w3c/pointerlock] Use xref to link document active sandboxing flag set (#57)

Closes #56  
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/pointerlock/pull/57

-- Commit Summary --

  * use xref to link `document active sandboxing flag set`
  * format file with tidy html5

-- File Changes --

    M index.html (8)

-- Patch Links --

https://github.com/w3c/pointerlock/pull/57.patch
https://github.com/w3c/pointerlock/pull/57.diff

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