title: JPF on a website, how to get it working right?
body: <p>I am trying to optimize my website using pagespeed, and I got the advice to use JPEG2000 instead of normal JPG. So I converted all my images but when I changed the images it doesn't show on my laptop. So I checked "caniuse" and now I see that this extension is only supported on mobile phones (android and ios)</p>
  
  <p>So how do I implement this in my website? Do I need to use javascript to change the extension to jpf if the device is a mobile phone?</p>
  
  <p>I use picture and srcset based on screensize, but that doesn't work if I drag my screen smaller on my laptop.. Does anyone know how to use this new JPEG2000?</p>