title: Best way to detect <= IE10
body: <p>What's an up-to-date way for detecting IE?<br></p>
  
  <ul>
  <li>conditional comments don't do <strike>IE9</strike>, IE10</li>
  <li>modernizr feature detection doesn't help here, because the reason is external (IE bug in a mapbox map I want to embed)</li>
  <li>jQuery + migrate plugin: if this helps, what are the basic steps?</li>
  </ul>
  
  <p>Yeah, I'm rather new to this. Cheers!</p>