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  <head class="test test">
    <title class=" ">Element.classList in case-sensitive documents</title>
    <link rel="help" href="https://dom.spec.whatwg.org/#concept-class">
    <script type="text/javascript" src="/resources/testharness.js"></script>
    <script type="text/javascript" src="/resources/testharnessreport.js"></script>
    <style type="text/css">
.foo { font-style: italic; }
    </style>
    <script type="text/javascript">
var elem = document.getElementsByTagName('title')[0], secondelem = document.getElementsByTagName('head')[0];
test(function () {
  assert_equals( typeof elem.classList, 'object', 'critical test; ignore any results after this' );
}, 'Element.classList must exist as an object');
test(function () {
  assert_equals( typeof document.documentElement.classList, 'object' );
}, 'Element.classList must exist as an object even if the element has no class attribute');
test(function () {
  assert_true( !!window.DOMTokenList );
}, 'DOMTokenList should be exposed for prototyping');
test(function () {
  DOMTokenList.prototype.customProperty = true;
  assert_true( elem.classList.customProperty );
}, 'prototyping DOMTokenList should work');
test(function () {
  assert_true( elem.classList instanceof window.DOMTokenList );
  assert_equals( elem.classList.constructor, window.DOMTokenList );
}, 'Element.classList must implement DOMTokenList');
test(function () {
  assert_not_equals( getComputedStyle(elem,null).fontStyle, 'italic', 'critical test; required by the testsuite' );
}, 'CSS .foo selectors must not match elements without any class');
test(function () {
  assert_equals( secondelem.classList.length, 1, 'duplicates in initial string should be removed per https://dom.spec.whatwg.org/#concept-class' );
  assert_equals( secondelem.classList.item(0), 'test' );
  assert_true( secondelem.classList.contains('test') );
}, 'classList must be correct for an element that has classes');
test(function () {
  assert_equals( elem.classList.length, 0 );
}, 'classList.length must be 0 for an element that has no classes');
test(function () {
  assert_false( elem.classList.contains('foo') );
}, 'classList must not contain an undefined class');
test(function () {
  assert_equals( elem.classList.item(0), null );
}, 'classList.item() must return null for out-of-range index');
test(function () {
  assert_equals( elem.classList.item(-1), null );
}, 'classList.item() must return null for negative index');
test(function () {
  /* the normative part of the spec states that:
  "unless tokens is empty, in which case there are no supported property indices"
  ...
  "The term[...] supported property indices [is] used as defined in the WebIDL specification."
  WebIDL creates actual OwnProperties and then [] just acts as a normal property lookup */
  assert_equals( elem.classList[0], undefined );
}, 'classList[index] must be undefined for out-of-range index');
test(function () {
  assert_equals( elem.classList[-1], undefined );
}, 'classList[index] must be undefined for negative index');
test(function () {
  assert_equals( elem.className, ' ' );
}, 'className should contain initial markup whitespace');
test(function () {
  assert_equals( elem.classList + '', '', 'implicit' );
  assert_equals( elem.classList.toString(), '', 'explicit' );
}, 'empty classList should return the empty string since the ordered set parser skip the whitespaces');
test(function () {
  assert_throws( 'SYNTAX_ERR', function () { elem.classList.contains(''); } );
}, '.contains(empty_string) must throw a SYNTAX_ERR');
test(function () {
  assert_throws( 'SYNTAX_ERR', function () { elem.classList.add(''); } );
}, '.add(empty_string) must throw a SYNTAX_ERR');
test(function () {
  assert_throws( 'SYNTAX_ERR', function () { elem.classList.remove(''); } );
}, '.remove(empty_string) must throw a SYNTAX_ERR');
test(function () {
  assert_throws( 'SYNTAX_ERR', function () { elem.classList.toggle(''); } );
}, '.toggle(empty_string) must throw a SYNTAX_ERR');
test(function () {
  assert_throws( 'INVALID_CHARACTER_ERR', function () { elem.classList.contains('a b'); } );
}, '.contains(string_with_spaces) must throw an INVALID_CHARACTER_ERR');
test(function () {
  assert_throws( 'INVALID_CHARACTER_ERR', function () { elem.classList.add('a b'); } );
}, '.add(string_with_spaces) must throw an INVALID_CHARACTER_ERR');
test(function () {
  assert_throws( 'INVALID_CHARACTER_ERR', function () { elem.classList.remove('a b'); } );
}, '.remove(string_with_spaces) must throw an INVALID_CHARACTER_ERR');
test(function () {
  assert_throws( 'INVALID_CHARACTER_ERR', function () { elem.classList.toggle('a b'); } );
}, '.toggle(string_with_spaces) must throw an INVALID_CHARACTER_ERR');
elem.className = 'foo';
test(function () {
  assert_equals( getComputedStyle(elem,null).fontStyle, 'italic', 'critical test; required by the testsuite' );
}, 'computed style must update when setting .className');
test(function () {
  assert_true( elem.classList.contains('foo') );
}, 'classList.contains must update when .className is changed');
test(function () {
  assert_false( elem.classList.contains('FOO') );
}, 'classList.contains must be case sensitive');
test(function () {
  assert_false( elem.classList.contains('foo.') );
  assert_false( elem.classList.contains('foo)') );
  assert_false( elem.classList.contains('foo\'') );
  assert_false( elem.classList.contains('foo$') );
  assert_false( elem.classList.contains('foo~') );
  assert_false( elem.classList.contains('foo?') );
  assert_false( elem.classList.contains('foo\\') );
}, 'classList.contains must not match when punctuation characters are added');
test(function () {
  elem.classList.add('FOO');
  assert_equals( getComputedStyle(elem,null).fontStyle, 'italic' );
}, 'classList.add must not cause the CSS selector to stop matching');
test(function () {
  assert_true( elem.classList.contains('foo') );
}, 'classList.add must not remove existing classes');
test(function () {
  assert_true( elem.classList.contains('FOO') );
}, 'classList.contains case sensitivity must match a case-specific string');
test(function () {
  assert_equals( elem.classList.length, 2 );
}, 'classList.length must correctly reflect the number of tokens');
test(function () {
  assert_equals( elem.classList.item(0), 'foo' );
}, 'classList.item(0) must return the first token');
test(function () {
  assert_equals( elem.classList.item(1), 'FOO' );
}, 'classList.item must return case-sensitive strings and preserve token order');
test(function () {
  assert_equals( elem.classList[0], 'foo' );
}, 'classList[0] must return the first token');
test(function () {
  assert_equals( elem.classList[1], 'FOO' );
}, 'classList[index] must return case-sensitive strings and preserve token order');
test(function () {
  /* the normative part of the spec states that:
  "The object's supported property indices are the numbers in the range zero to the number of tokens in tokens minus one"
  ...
  "The term[...] supported property indices [is] used as defined in the WebIDL specification."
  WebIDL creates actual OwnProperties and then [] just acts as a normal property lookup */
  assert_equals( elem.classList[2], undefined );
}, 'classList[index] must still be undefined for out-of-range index when earlier indexes exist');
test(function () {
  assert_equals( elem.className, 'foo FOO' );
}, 'className must update correctly when items have been added through classList');
test(function () {
  assert_equals( elem.classList + '', 'foo FOO', 'implicit' );
  assert_equals( elem.classList.toString(), 'foo FOO', 'explicit' );
}, 'classList must stringify correctly when items have been added');
test(function () {
  elem.classList.add('foo');
  assert_equals( elem.classList.length, 2 );
  assert_equals( elem.classList + '', 'foo FOO', 'implicit' );
  assert_equals( elem.classList.toString(), 'foo FOO', 'explicit' );
}, 'classList.add should not add a token if it already exists');
test(function () {
  elem.classList.remove('bar');
  assert_equals( elem.classList.length, 2 );
  assert_equals( elem.classList + '', 'foo FOO', 'implicit' );
  assert_equals( elem.classList.toString(), 'foo FOO', 'explicit' );
}, 'classList.remove removes arguments passed, if they are present.');
test(function () {
  elem.classList.remove('foo');
  assert_equals( elem.classList.length, 1 );
  assert_equals( elem.classList + '', 'FOO', 'implicit' );
  assert_equals( elem.classList.toString(), 'FOO', 'explicit' );
  assert_false( elem.classList.contains('foo') );
  assert_true( elem.classList.contains('FOO') );
}, 'classList.remove must remove existing tokens');
test(function () {
  assert_not_equals( getComputedStyle(elem,null).fontStyle, 'italic' );
}, 'classList.remove must not break case-sensitive CSS selector matching');
test(function () {
  secondelem.classList.remove('test');
  assert_equals( secondelem.classList.length, 0 );
  assert_false( secondelem.classList.contains('test') );
}, 'classList.remove must remove duplicated tokens');
test(function () {
  secondelem.className = 'token1 token2 token3';
  secondelem.classList.remove('token2');
  assert_equals( secondelem.classList + '', 'token1 token3', 'implicit' );
  assert_equals( secondelem.classList.toString(), 'token1 token3', 'explicit' );
}, 'classList.remove must collapse whitespace around removed tokens');
test(function () {
  secondelem.className = ' token1 token2  ';
  secondelem.classList.remove('token2');
  assert_equals( secondelem.classList + '', 'token1', 'implicit' );
  assert_equals( secondelem.classList.toString(), 'token1', 'explicit' );
}, 'classList.remove must collapse whitespaces around each token');
test(function () {
  secondelem.className = '  token1  token2  token1  ';
  secondelem.classList.remove('token2');
  assert_equals( secondelem.classList + '', 'token1', 'implicit' );
  assert_equals( secondelem.classList.toString(), 'token1', 'explicit' );
}, 'classList.remove must collapse whitespaces around each token and remove duplicates');
test(function () {
  secondelem.className = '  token1  token2  token1  ';
  secondelem.classList.remove('token1');
  assert_equals( secondelem.classList + '', 'token2', 'implicit' );
  assert_equals( secondelem.classList.toString(), 'token2', 'explicit' );
}, 'classList.remove must collapse whitespace when removing duplicate tokens');
test(function () {
  secondelem.className = '  token1  token1  ';
  secondelem.classList.add('token1');
  assert_equals( secondelem.classList + '', 'token1', 'implicit' );
  assert_equals( secondelem.classList.toString(), 'token1', 'explicit' );
}, 'classList.add must collapse whitespaces and remove duplicates when adding a token that already exists');
test(function () {
  assert_true(elem.classList.toggle('foo'));
  assert_equals( elem.classList.length, 2 );
  assert_true( elem.classList.contains('foo') );
  assert_true( elem.classList.contains('FOO') );
}, 'classList.toggle must toggle tokens case-sensitively when adding');
test(function () {
  assert_equals( getComputedStyle(elem,null).fontStyle, 'italic' );
}, 'classList.toggle must not break case-sensitive CSS selector matching');
test(function () {
  assert_false(elem.classList.toggle('foo'));
}, 'classList.toggle must be able to remove tokens');
test(function () {
  //will return true if the last test incorrectly removed both
  assert_false(elem.classList.toggle('FOO'));
  assert_false( elem.classList.contains('foo') );
  assert_false( elem.classList.contains('FOO') );
}, 'classList.toggle must be case-sensitive when removing tokens');
test(function () {
  assert_not_equals( getComputedStyle(elem,null).fontStyle, 'italic' );
}, 'CSS class selectors must stop matching when all classes have been removed');
test(function () {
  assert_equals( elem.className, '' );
}, 'className must be empty when all classes have been removed');
test(function () {
  assert_equals( elem.classList + '', '', 'implicit' );
  assert_equals( elem.classList.toString(), '', 'explicit' );
}, 'classList must stringify to an empty string when all classes have been removed');
test(function () {
  assert_equals( elem.classList.item(0), null );
}, 'classList.item(0) must return null when all classes have been removed');
test(function () {
  /* the normative part of the spec states that:
  "unless the length is zero, in which case there are no supported property indices"
  ...
  "The term[...] supported property indices [is] used as defined in the WebIDL specification."
  WebIDL creates actual OwnProperties and then [] just acts as a normal property lookup */
  assert_equals( elem.classList[0], undefined );
}, 'classList[0] must be undefined when all classes have been removed');
// The ordered set parser must skip ASCII whitespace (U+0009, U+000A, U+000C, U+000D, and U+0020.)
test(function () {
  var foo = document.createElement('div');
  foo.className = 'a ';
  foo.classList.add('b');
  assert_equals(foo.className,'a b');
}, 'classList.add should treat " " as a space');
test(function () {
  var foo = document.createElement('div');
  foo.className = 'a\t';
  foo.classList.add('b');
  assert_equals(foo.className,'a b');
}, 'classList.add should treat \\t as a space');
test(function () {
  var foo = document.createElement('div');
  foo.className = 'a\r';
  foo.classList.add('b');
  assert_equals(foo.className,'a b');
}, 'classList.add should treat \\r as a space');
test(function () {
  var foo = document.createElement('div');
  foo.className = 'a\n';
  foo.classList.add('b');
  assert_equals(foo.className,'a b');
}, 'classList.add should treat \\n as a space');
test(function () {
  var foo = document.createElement('div');
  foo.className = 'a\f';
  foo.classList.add('b');
  assert_equals(foo.className,'a b');
}, 'classList.add should treat \\f as a space');
test(function () {
  //WebIDL and ECMAScript 5 - a readonly property has a getter but not a setter
  //ES5 makes [[Put]] fail but not throw
  var failed = false;
  secondelem.className = 'token1';
  try {
    secondelem.classList.length = 0;
  } catch(e) {
    failed = e;
  }
  assert_equals(secondelem.classList.length,1);
  assert_false(failed,'an error was thrown');
}, 'classList.length must be read-only');
test(function () {
  var failed = false, realList = secondelem.classList;
  try {
    secondelem.classList = '';
  } catch(e) {
    failed = e;
  }
  assert_equals(secondelem.classList,realList);
  assert_false(failed,'an error was thrown');
}, 'classList must be read-only');
    </script>
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