Test FF scrollbar disapper?

No, webkit-scrollbar only works for Chrome.

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<p>
  result width: <span id="result"></span>
</p>
<div style="width:50px; height:50px; overflow:scroll; background: green">
  <div style="width:300px, height:600px; background: cyan">
    huh? blah? blah? blala?
    <p>
      blah? blah? blala?
      <p>
        blah? blah? blala?
        <p>
          blah? blah? blala?
          <p>
            blah? blah? blala?
            <p>
              blah? blah? blala?
            </p>
  </div>
</div>

<div style="width:100px; height:200px; overflow:scroll; background: green">
  <div style="width:300px, height:600px; background: grey">
    huh? blah? blah? blala?
    <p>
      blah? blah? blala?
      <p>
        blah? blah? blala?
        <p>
          blah? blah? blala?
          <p>
            blah? blah? blala?
            <p>
              blah? blah? blala?
            </p>
  </div>
</div>

JavaScript

setTimeout(function() {

  $('#result').text($.position.scrollbarWidth());
  console.log($.position.scrollbarWidth());


}, 1000);