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<meta charset=utf-8>
<title>ChildNode.before</title>
<link rel=help href="https://dom.spec.whatwg.org/#dom-childnode-before">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function test_before(child, nodeName, innerHTML) {
test(function() {
var parent = document.createElement('div');
parent.appendChild(child);
child.before();
assert_equals(parent.innerHTML, innerHTML);
}, nodeName + '.before() without any argument.');
test(function() {
var parent = document.createElement('div');
parent.appendChild(child);
child.before(null);
var expected = 'null' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with null as an argument.');
test(function() {
var parent = document.createElement('div');
parent.appendChild(child);
child.before(undefined);
var expected = 'undefined' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with undefined as an argument.');
test(function() {
var parent = document.createElement('div');
parent.appendChild(child);
child.before('');
assert_equals(parent.firstChild.data, '');
}, nodeName + '.before() with the empty string as an argument.');
test(function() {
var parent = document.createElement('div');
parent.appendChild(child);
child.before('text');
var expected = 'text' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with only text as an argument.');
test(function() {
var parent = document.createElement('div');
var x = document.createElement('x');
parent.appendChild(child);
child.before(x);
var expected = '<x></x>' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with only one element as an argument.');
test(function() {
var parent = document.createElement('div');
var x = document.createElement('x');
parent.appendChild(child);
child.before(x, 'text');
var expected = '<x></x>text' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with one element and text as arguments.');
test(function() {
var parent = document.createElement('div');
parent.appendChild(child);
child.before('text', child);
var expected = 'text' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with context object itself as the argument.');
test(function() {
var parent = document.createElement('div')
var x = document.createElement('x');
parent.appendChild(child);
parent.appendChild(x);
child.before(x, child);
var expected = '<x></x>' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with context object itself and node as the arguments, switching positions.');
test(function() {
var parent = document.createElement('div');
var x = document.createElement('x');
var y = document.createElement('y');
var z = document.createElement('z');
parent.appendChild(y);
parent.appendChild(child);
parent.appendChild(x);
child.before(x, y, z);
var expected = '<x></x><y></y><z></z>' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with all siblings of child as arguments.');
test(function() {
var parent = document.createElement('div')
var x = document.createElement('x');
var y = document.createElement('y');
var z = document.createElement('z');
parent.appendChild(x);
parent.appendChild(y);
parent.appendChild(z);
parent.appendChild(child);
child.before(y, z);
var expected = '<x></x><y></y><z></z>' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with some siblings of child as arguments; no changes in tree; viable sibling is first child.');
test(function() {
var parent = document.createElement('div')
var v = document.createElement('v');
var x = document.createElement('x');
var y = document.createElement('y');
var z = document.createElement('z');
parent.appendChild(v);
parent.appendChild(x);
parent.appendChild(y);
parent.appendChild(z);
parent.appendChild(child);
child.before(y, z);
var expected = '<v></v><x></x><y></y><z></z>' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with some siblings of child as arguments; no changes in tree.');
test(function() {
var parent = document.createElement('div');
var x = document.createElement('x');
var y = document.createElement('y');
parent.appendChild(x);
parent.appendChild(y);
parent.appendChild(child);
child.before(y, x);
var expected = '<y></y><x></x>' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() when pre-insert behaves like prepend.');
test(function() {
var parent = document.createElement('div');
var x = document.createElement('x');
parent.appendChild(x);
parent.appendChild(document.createTextNode('1'));
var y = document.createElement('y');
parent.appendChild(y);
parent.appendChild(child);
child.before(x, '2');
var expected = '1<y></y><x></x>2' + innerHTML;
assert_equals(parent.innerHTML, expected);
}, nodeName + '.before() with one sibling of child and text as arguments.');
test(function() {
var x = document.createElement('x');
var y = document.createElement('y');
x.before(y);
assert_equals(x.previousSibling, null);
}, nodeName + '.before() on a child without any parent.');
}
test_before(document.createComment('test'), 'Comment', '<!--test-->');
test_before(document.createElement('test'), 'Element', '<test></test>');
test_before(document.createTextNode('test'), 'Text', 'test');
</script>
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