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<!DOCTYPE html>
<html>
<head>
<title>Hidden input element</title>
<link rel="author" title="Kinuko Yasuda" href="mailto:kinuko@chromium.org">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#hidden-state-(type=hidden)">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<h1>Hidden input element</h1>
<div style="display: none">
<input id="hidden" type="hidden" />
<input id="hidden_with_value" type="hidden" value="foo" />
</div>
<div id="log"></div>
<script type="text/javascript">
test(
function() {
assert_equals(document.getElementById("hidden").value, "");
assert_equals(document.getElementById("hidden_with_value").value, "foo");
}, "Value returns the current value for hidden");
test(
function() {
document.getElementById("hidden").value = "A";
assert_equals(document.getElementById("hidden").value, "A");
document.getElementById("hidden").value = "B";
assert_equals(document.getElementById("hidden").value, "B");
}, "Setting value changes the current value for hidden");
test(
function() {
assert_equals(document.getElementById("hidden").files, null);
}, "files attribute must return null for hidden");
test(
function() {
assert_equals(document.getElementById("hidden").valueAsDate, null);
}, "valueAsDate attribute must return null for hidden");
test(
function() {
assert_equals(document.getElementById("hidden").valueAsNumber, NaN);
}, "valueAsNumber attribute must return NaN for hidden");
test(
function() {
assert_equals(document.getElementById("hidden").list, null);
}, "list attribute must return null for hidden");
test(
function() {
var el = document.getElementById("hidden");
assert_throws("InvalidStateError", function() { el.stepDown(); }, "");
}, "stepDown does not apply for hidden");
test(
function() {
var el = document.getElementById("hidden");
assert_throws("InvalidStateError", function() { el.stepUp(); }, "");
}, "stepUp does not apply for hidden");
test(function(){
var el = document.getElementById("hidden");
assert_false(el.willValidate);
}, "input type=hidden is barred from constraint validation");
</script>
</body>
</html>
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