[prefix-suffix-syntax.html]
  [@counter-style 'prefix: url("https://example.com/foo.png")' is valid]
    expected: FAIL

  [@counter-style 'suffix: url("https://example.com/foo.png")' is valid]
    expected: FAIL

  [@counter-style 'prefix: url(https://example.com/foo.png)' is valid]
    expected: FAIL

  [@counter-style 'suffix: url(https://example.com/foo.png)' is valid]
    expected: FAIL

  [@counter-style 'prefix: linear-gradient(yellow, blue)' is valid]
    expected: FAIL

  [@counter-style 'suffix: linear-gradient(yellow, blue)' is valid]
    expected: FAIL
