[fail-to-resolve.html]
  type: testharness
  [<img src="//[">]
    expected: FAIL

  [<img srcset="//[">]
    expected: FAIL

  [<img srcset="//[" src="/images/red.png">]
    expected: FAIL

  [<img srcset="//[, /images/red.png">]
    expected: FAIL