title: Why is this JSONP url written like this?
body: <p>Now I am attempting to do a random quote generator challenge from freecodecamp.
  However, I have been having a lot of trouble to get the quotes from the site 
  <a href="http://api.forismatic.com" rel="nofollow noreferrer">http://api.forismatic.com</a> due to CORS ... then I stumbled upon someone's solution but I don't understand why he has included a query <code>jsonp=?</code> at the end of the url.</p>
  
  <p>He created:</p>
  
  <pre><code>// Random Quote Generator
  var url = "http://api.forismatic.com/api/1.0/?method=getQuote&amp;key=457653&amp;format=jsonp&amp;lang=en&amp;jsonp=?";
  </code></pre>
  
  <p>I follow everything except for the <code>jsonp=?</code> at the end ... 
  I know there has to be a callback and I tried to replace it with <code>callback=?</code>
  but then got an error: </p>
  
  <pre><code>"Refuse to execute script from (data resource) because its MIME type ('text/html') is not executable, and strict MIME type checking is enabled."
  </code></pre>