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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<title>Forms</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<p>
<h3>button_validity</h3>
</p>
<hr>
<div id="log"></div>
<form method="post"
enctype="application/x-www-form-urlencoded"
action=""
id="input_form">
<p><button id='button_id'>button</button></p>
</form>
<script>
var button = document.getElementById("button_id");
if (typeof(button.validity) == "object") {
test(function() {
assert_equals(button.validity.valueMissing, false, "validity attribute is not correct.");
});
} else {
test(function() {
assert_unreached("validity attribute is not exist.");
});
}
</script>
</body>
</html>