<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
  </head>
  <body>
    <h1>A Basic DevTools Extension Interacting with the Inspected Page</h1>
    <input type="button" id="sayHello" value="Say Hello to The Inspected Page!">
    <h2><span id="youClickedOn"></span></h2>
  </body>
</html>
