Allow users to send their HTML input string as a GET parameter

[0xedward]

• This will allow users to share their DOM visualizer with others in one URL
• i.e. https://0xedward.github.io/EQKL?html=<script>alert(1)</script> can be shared to other users and once the URL is opened, we read the value of html GET parameter and automatically generate the DOM tree
• Add event listener on DOMContentLoaded
  • https://developer.mozilla.org/en-US/docs/Web/API/Window#load_unload_events
• https://stackoverflow.com/questions/831030/how-to-get-get-request-parameters-in-javascript