CSS3 (if your browser supports)
<div class="marquee">jQuery marquee is the best marquee plugin in the world</div>

<br>

jQuery (check data attribute to disable CSS3 animation support)
<div class="marquee" data-allowCss3Support='false'>jQuery marquee is the best marquee plugin in the world</div>
.marquee {
  width: 300px;
  overflow: hidden;
  border: 1px solid #ccc;
  background: #ccc;
}
$('.marquee').marquee();

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js
  2. https://cdn.jsdelivr.net/jquery.marquee/1.3.1/jquery.marquee.min.js