ChildNode-before.html

<!DOCTYPE html>

<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>

</html>