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<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: The label element</title>
<link rel="author" title="Intel" href="http://www.intel.com/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<form id="fm" style="display:none">
<label id="lbl0" for="test0"></label>
<b id="test0"></b>
<input id="test1"></input>
<label id="lbl1">
<a id="test2"></a>
<div><input id="test3"></div>
<input id="test4">
</label>
<label id="lbl2" for="testx">
<input id="test5">
</label>
<label id="lbl3" for="test6">
<b id="test6"></b>
<input id="test6" class="class1">
</label>
<label id="lbl4" for="">
<input id="" class="class2">
</label>
<label id="lbl5" for="test7"></label>
<input id="test7">
</form>
<label id="lbl6" for="test7"></label>
<script>
//control attribute
test(function () {
assert_not_equals(document.getElementById("lbl0").control, document.getElementById("test0"),
"An element that's not a labelable element can't be a label element's labeled control.");
assert_equals(document.getElementById("lbl0").control, null,
"A label element whose 'for' attribute doesn't reference any labelable element shouldn't have any labeled control.");
}, "A label element with a 'for' attribute should only be associated with a labelable element.");
test(function () {
var label = document.createElement("label");
label.htmlFor = "test1";
assert_not_equals(label.control, document.getElementById("test1"),
"A label element not in a document should not label an element in a document.");
document.body.appendChild(label);
assert_equals(label.control, document.getElementById("test1"));
label.remove();
}, "A label element not in a document can not label any element in the document.");
test(function () {
assert_equals(document.getElementById("lbl1").control, document.getElementById("test3"),
"The first labelable descendant of a label element should be its labeled control.");
var input = document.createElement("input");
document.getElementById("lbl1").insertBefore(input, document.getElementById("test2"));
assert_equals(document.getElementById("lbl1").control, input,
"The first labelable descendant of a label element in tree order should be its labeled control.");
input.remove();
}, "The labeled control for a label element that has no 'for' attribute is the first labelable element which is a descendant of that label element.");
test(function () {
assert_equals(document.getElementById("lbl2").control, null,
"The label's 'control' property should return null if its 'for' attribute points to an inexistent element.");
}, "The 'for' attribute points to an inexistent id.");
test(function () {
assert_equals(document.getElementById("lbl3").control, null, "The label should have no control associated.");
assert_equals(document.querySelector(".class1").labels.length, 0);
}, "A non-control follows by a control with same ID.");
test(function () {
assert_equals(document.getElementById("lbl4").control, null,
"A label element with an empty 'for' attribute should not associate with anything.");
}, "The 'for' attribute is an empty string.");
//labels attribute
test(function () {
var labels = document.getElementById("test7").labels;
assert_true(labels instanceof NodeList,
"A form control's 'labels' property should be an instance of a NodeList.");
assert_equals(labels.length, 2,
"The number of labels associated with a form control should be the number of label elements for which it is a labeled control.");
assert_array_equals(labels, [document.getElementById("lbl5"), document.getElementById("lbl6")],
"The labels for a form control should be returned in tree order.");
var newLabel = document.createElement("label");
newLabel.htmlFor = "test7";
document.getElementById("fm").insertBefore(newLabel, document.getElementById("lbl0"));
assert_array_equals(document.getElementById("test7").labels, [newLabel, document.getElementById("lbl5"), document.getElementById("lbl6")],
"The labels for a form control should be returned in tree order.");
newLabel.remove();
}, "A form control has multiple labels.");
test(function () {
var labels = document.getElementById("test3").labels;
assert_true(labels instanceof NodeList, "A form control's 'labels' property should be an instance of a NodeList.");
assert_equals(labels.length, 1, "The form control has an ancestor with no explicit associated label, and is the first labelable descendant.");
}, "A form control has an implicit label.");
test(function () {
var labels = document.getElementById("test4").labels;
assert_true(labels instanceof NodeList, "A form control's 'labels' property should be an instance of a NodeList.");
assert_equals(labels.length, 0, "The form control has an ancestor with no explicit associated label, but is *not* the first labelable descendant");
}, "A form control has no label 1.");
test(function () {
assert_equals(document.getElementById("test5").labels.length, 0,
"The number of labels should be 0 if the form control has an ancestor label element that the for attribute points to another control.");
assert_equals(document.getElementById("lbl2").control, null,
"The labeled cotrol should be associated with the control whose ID is equal to the value of the 'for' attribute.");
}, "A form control has no label 2.");
// form attribute
test(function () {
assert_equals(document.getElementById("lbl0").form, null,
"The 'form' property for a label should return null if label.control is null.");
}, "A label in a form without a control");
test(function () {
assert_equals(document.getElementById("lbl6").form, document.getElementById("fm"),
"The 'form' property for a label should return label.control.form.");
}, "A label outside a form with a control inside the form");
// htmlFor attribute
test(function () {
assert_equals(document.getElementById("lbl2").htmlFor, "testx");
}, "A label's htmlFor attribute must reflect the for content attribute");
</script>
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