DOM Enlightenment Book

HTML

<script src="https://getfirebug.com/firebug-lite-debug.js"></script>
<ul>
  <li>Hello</li>
  <li>world</li>
</ul>







































<h4 style="border-top:1px solid #ADADAD;padding-top:20px;margin-top:20px;"><strong>&larr; Code Example from <a href="http://www.domenlightenment.com/" target="_blank">DOM Enlightenment Book</a> by <a href="http://www.codylindley.com" target="_blank">Cody Lindley</a></strong></h4>

<p>JavaScript code is executed on page load. Click the "Run" button in the top bar to re-run the JavaScript code. All <code>console.log()'s</code> are logged to the <a href="http://getfirebug.com/firebuglite" target="_blank">Firebug Lite</a> console below
  &darr;.</p>

JavaScript

//fails in modern browser must use browser prefix moz, webkit, o, and ms
console.log(document.querySelector('li').matchesSelector('li:first-child')); //logs false

//prefix moz
//console.log(document.querySelector('li').mozMatchesSelector('li:first-child'));

//prefix webkit
//console.log(document.querySelector('li').webkitMatchesSelector('li:first-child'));

//prefix o
//console.log(document.querySelector('li').oMatchesSelector('li:first-child'));

//prefix ms
//console.log(document.querySelector('li').msMatchesSelector('li:first-child'));