[history-iframe.sub.html]
  [History navigation in iframe: "about:blank" document is navigated back from history same-origin.]
    expected: FAIL

  [History navigation in iframe: "about:blank" document is navigated back from history cross-origin.]
    expected: FAIL

  [History navigation in iframe: blob URL document is navigated back from history same-origin.]
    expected: FAIL

  [History navigation in iframe: blob URL document is navigated back from history cross-origin.]
    expected: FAIL

  [History navigation in iframe: data URL document is navigated back from history same-origin.]
    expected: FAIL

  [History navigation in iframe: data URL document is navigated back from history cross-origin.]
    expected: FAIL