title: how do I add width values to increase by x amount?
body: <p>I'm making an EFPS bar for games, and ive got JS code to get the ID of the element. This works perfect, but how do I get it to add 30% to the already existing width percent of the bar? The width it's set to by default is 18. So it should change to 48% but it replaces it with 30%. I have tried using += but that just makes it not work.</p>
  <pre><code>document.getElementById(&quot;mwfps&quot;).style.width = &quot;30%&quot;;
  </code></pre>