Untitled

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<a href="home.php"></a>
<title>Untitled Document</title>
</head>

<div class="container">
  <h2>Freetuts.net hướng dẫn tạo Toggle ẩn/hiện nội dung</h2>
 <div id="dongho"></div>
<script>
	var so = 5 ;
	function demnguoc(){
		so--;
		if(so != 0){
			document.getElementById("dongho").innerHTML = so;
			 setTimeout(demnguoc,1000)
		}else{
			  document.forms[0].submit()
			}
	}
		demnguoc();
	</script>

<?php
	if(isset($_POST['aab'])){
		echo 'xong';
	}
	?>
<form action="" method="post" name="acc">
	<input type="text" value="đawdad">
	<input type="text" value="đawdad">
	<input type="text" value="đawdad">
	<input type="submit" name="aab">
</form>
</div>
</body>
</html>