[whatwg/dom] Enable an event listener to be invoked just once (#207)

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

  https://github.com/whatwg/dom/pull/207

-- Commit Summary --

  * Enable an event listener to be invoked just once

-- File Changes --

    M dom.bs (47)
    M dom.html (40)

-- Patch Links --

https://github.com/whatwg/dom/pull/207.patch
https://github.com/whatwg/dom/pull/207.diff

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