Internet Explorer Coding Issues

There's a special place in my heart for Internet Explorer memes but it's always a pain to deal with its quirks. Below are some of its issues:

I'll add something to this list every now and then because IE is awesome.

angular - Don't put (click) methods on <i>.
.includes() won't work.
IE caching is always on
d-flex - messed up layout if child elements aren't inside a <div>

<!-- Won't work -->
<div class="d-flex">
   <button>Button 1</button>
   <button>Button 2</button>
</div>

<!-- Will work -->
<div class="d-flex">
   <div>
      <button>Button 1</button>
   </div>
   <div>
      <button>Button 2</button>
   </div>
</div>