[w3c/gamepad] Add global event handler attributes (#144)

Closes #141 

The following tasks have been completed:

 * [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
 * [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)


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<a href="https://pr-preview.s3.amazonaws.com/w3c/gamepad/pull/144.html" title="Last updated on Dec 21, 2020, 9:16 PM UTC (bc70b7f)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/gamepad/144/bafd0eb...bc70b7f.html" title="Last updated on Dec 21, 2020, 9:16 PM UTC (bc70b7f)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/gamepad/pull/144

-- Commit Summary --

  * Add global event handler attributes

-- File Changes --

    M index.html (20)

-- Patch Links --

https://github.com/w3c/gamepad/pull/144.patch
https://github.com/w3c/gamepad/pull/144.diff

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https://github.com/w3c/gamepad/pull/144