title: How to perform change detection on div resizing
body: <p>I use Bootstrap for my layout and I need to check if the automatic calculated size of my <code>div</code> with bootstrap for example width = 25% is changed.</p>
  <p>How to perform change detection on a attribute which I don't set in my template, but is set by Bootstrap?</p>
  <p><code>(window:resize)</code> is not enough.</p>