Pen Settings



CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using it's URL and the proper URL extention.

+ add another resource


Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource


Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.


Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.


                <svg xmlns="" xmlns:xlink=""
	 width="300px" height="200px" viewBox="0 0 685 310">
	  <path id="loop-normal" d="M 342.5,155 C 355,172.5 447,305 525,305 607,305 675,237 675,155 675,73 607,5 525,5 447,5 355,137.5 342.5,155 330,172.5 238,305 160,305 78,305 10,237 10,155 10,73 78,5 160,5 238,5 330,137.5 342.5,155 Z"/>

    <!-- radial gradient has same color at constnnt distance from center,
         regardless of direction-->
	  <radialGradient id="fade" cx="0" cy="0" fx="0" fy="0" r="200" gradientUnits="userSpaceOnUse">
	    <stop stop-color="#000" stop-opacity="1" offset="0" />
      <!-- change offset to make faiding "tail" longer or shorter -->
	    <stop stop-color="#000" stop-opacity="1" offset="0.6" />
	    <stop stop-color="#000" stop-opacity="0" offset="1" />

    <!-- mask shows only stroked area of path. Stroke length must be longer
         than gradient radius, as path can be curved-->
	  <mask id="tail" maskUnits="userSpaceOnUse">
      <use style="fill:none;stroke:#fff;stroke-width:6;stroke-dasharray:250 1664"
        <animate attributeName="stroke-dashoffset" from="250" to="-1664"
          	     dur="3s" repeatCount="indefinite"/>  
  <use style="fill:none;stroke:#ccc;stroke-width:6;"
       xlink:href="#loop-normal" />

  <!-- outer group makes sure mask is applied after animateMotion -->
  <g style="mask:url(#tail)">
    <!-- circle with gradient radius -->
    <circle style="fill:url(#fade);" cx="0" cy="0" r="200"> 
      <animateMotion keyPoints="0;1" keyTimes="0;1"
                     dur="3s" repeatCount="indefinite">
	      <mpath xlink:href="#loop-normal"/>

	<!-- leading dot circle -->
  <circle style="fill:#000" cx="0" cy="0" r="7"> 
	  <animateMotion keyPoints="0;1" keyTimes="0;1"
	                 dur="3s" repeatCount="indefinite">
		  <mpath xlink:href="#loop-normal"/>