[popover-events.html]
  [The "beforetoggle" event (listener) get properly dispatched for popovers]
    expected:
      if (os == "win") and (processor == "x86_64"): [FAIL, PASS]
      if (os == "mac") and not debug: PASS
      if (os == "linux") and (processor == "x86"): [FAIL, PASS]
      [PASS, FAIL]

  [The "beforetoggle" event (attribute) get properly dispatched for popovers]
    expected:
      if (os == "win") and (processor == "x86_64"): [FAIL, PASS]
      if (os == "mac") and not debug: PASS
      if (os == "linux") and (processor == "x86"): [FAIL, PASS]
      [PASS, FAIL]

  [The "beforetoggle" event is cancelable for the "opening" transition]
    expected:
      if (os == "win") and (processor == "x86_64"): [FAIL, PASS]
      if (os == "mac") and not debug: PASS
      if (os == "linux") and (processor == "x86"): [FAIL, PASS]
      [PASS, FAIL]

  [The "beforetoggle" event is not fired for element removal]
    expected:
      if (os == "win") and (processor == "x86_64"): [FAIL, PASS]
      if (os == "mac") and not debug: PASS
      if (os == "linux") and (processor == "x86"): [FAIL, PASS]
      [PASS, FAIL]

  [The "toggle" event is coalesced]
    expected:
      if (os == "win") and (processor == "x86_64"): [FAIL, PASS]
      if (os == "mac") and not debug: PASS
      if (os == "linux") and (processor == "x86"): [FAIL, PASS]
      [PASS, FAIL]