html5是目前最新版的超文本标记语言，结合了javascript/css/html使得标签功能更加强大，下面介绍html5自定义表单提示：1
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20<form name="passwordChange">
<p>
<label for="password1">New Password:</label>
<input type="password" id="password1" onchange="checkPasswords()">
</p>
<p>
<label for="password2">Confirm Password:</label>
<input type="password" id="password2" onchange="checkPasswords()">
</p>
</form>
<button onclick="document.passwordChange.password1.checkValidity()">Check Validity</button>
<script>
function checkPasswords() {
var pass1 = document.getElementById("password1");
var pass2 = document.getElementById("password2");
if (pass1.value != pass2.value)
pass1.setCustomValidity("两次输入的密码不匹配");
else
pass1.setCustomValidity("");
</script>