Tryit Editor v2.7

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>
input:invalid {
    border: 2px solid red;
}
</style>

<script>
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
hm.src = "//hm.baidu.com/hm.js?73c27e26f610eb3c9f3feb0c75b03925";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
</head>
<body>

<h3>A demonstration of the :invalid selector.</h3>

<input type="email" value="supportEmail">

<p>Try typing a legal e-mail address, to see the styling disappear.</p>

<p><strong>Note</strong>: The :invalid selector is not supported in Internet Explorer 9 and earlier versions.</p>

</body>
</html>