md test
ex
A1 [l](javascript:alert(1))
A2 ![i](x" onerror="alert(2))
A3 [d](data:text/html,<script>alert(3)</script>)
A4 <javascript:alert(4)>
A5 [e](javascript:alert(5))
A6 bold
A7 [f][r]
[r]: javascript:alert(7)
ex
A1 [l](javascript:alert(1))
A2 ![i](x" onerror="alert(2))
A3 [d](data:text/html,<script>alert(3)</script>)
A4 <javascript:alert(4)>
A5 [e](javascript:alert(5))
A6 bold
A7 [f][r]
[r]: javascript:alert(7)