[install-element-url-attributes.tentative.html]
  [The manifest IDL attribute resolves a relative URL against the document base URL]
    expected: FAIL

  [The manifest IDL attribute trims HTML whitespace before resolving a relative URL]
    expected: FAIL

  [The manifestId IDL attribute resolves a relative URL against the document base URL]
    expected: FAIL

  [The manifestId IDL attribute trims HTML whitespace before resolving a relative URL]
    expected: FAIL

  [The manifest and manifestId IDL attributes are empty strings when omitted]
    expected: FAIL

  [The manifest IDL attribute setter stringifies null]
    expected: FAIL

  [The manifestId IDL attribute setter stringifies null]
    expected: FAIL