Basic JavaScript Code

<!DOCTYPE html>
<html>
  <head>
    <title>Hello World!</title>
  </head>
  <body>
    <button
      type="button"
      onclick='document.getElementById("text").innerHTML = "John Doe"'
    >
      Click Me!
    </button>
    <h1>You Can Change Text With JavaScript!</h1>
    <p id="text">Hello and i'm...</p>
  </body>
</html>