title: Javascript: MutationObserver / detect global stylesheet rule changes
body: <p>I've been stuck for the past couple of days, trying to figure out a way to detect / trigger a global CSS change event. Yes, a global one (so not one which is set by the element itself <strong>(style="background:red;" for example)</strong>, but is set in a seperate <strong>.css</strong> file).</p>
  
  <p>I've tried using <strong>MutationObserver</strong> (as my event catcher / instance), but this instance doesn't seem to pick up my fulfilling. The most logical way instead (according to my knowledge), would be to store all the CSS-rules (of the target file) and set an interval which will check for any updates (comparing the list stored) every x seconds. But ofcourse, this wouldn't be such a good practice since this is a waste of memory.</p>
  
  <p>Any suggestions? They would be appericiated a lot!</p>