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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <svg version="1.1"
	 id="svg2" inkscape:version="0.91 r13725" sodipodi:docname="Domestic_Dromedary_silhouette.svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" 
	 viewBox="0 0 1578 1184"  xml:space="preserve">
<style type="text/css">
	.st0{stroke:#000000;stroke-miterlimit:10;}
	.st1{stroke:#CCCCCC; fill:none;}
</style>

<path id="circle-1" class="st1 path" d="M1202.67111,575.383626 C1220.43488,533.961303 1225.24704,492.57539 1219.11972,453.349798 C1213.14392,415.058726 1196.73773,378.788403 1171.73753,346.365392 C1147.27674,314.63417 1114.49467,286.49539 1074.94285,263.569293 C1036.05164,241.025501 990.390677,223.415249 939.184221,212.285958 C888.480798,201.271965 836.60767,197.546019 785.946672,200.1736 C735.334159,202.795112 685.49741,211.782287 638.903111,226.340177 C591.969414,241.013364 547.956953,261.475724 509.526352,287.023333 C470.51999,312.965383 436.980337,344.350712 411.85287,380.554283 C386.155701,417.577077 371.555588,456.323272 367.434344,494.84494 C363.210069,534.295061 369.979819,573.520653 387.119345,610.288578 C404.646753,647.899998 432.986367,682.835292 471.283632,712.545765 C510.320298,742.82666 559.472193,767.5065 617.509006,783.866679 C676.218551,800.421044 737.928119,806.738161 798.83162,803.867848 C859.801789,801.003603 919.329522,788.957996 973.742064,769.084262 C1027.66975,749.374373 1076.08225,722.14584 1115.62195,688.855061 C1154.48286,656.146839 1184.47097,617.825426 1202.67111,575.383626"/>
<path id="circle-1-active" class="st1" d="M1202.7,575.4c17.8-41.4,22.6-82.8,16.4-122c-6-38.3-22.4-74.6-47.4-107
						c-24.5-31.7-57.2-59.9-96.8-82.8c-38.9-22.5-95.9-93-147.1-104.1c-50.7-11-91.3,38.1-141.9,40.7c-50.6,2.6-100.4,11.6-147,26.2
						C592,241,548,261.5,509.5,287c-39,25.9-72.5,57.3-97.7,93.5c-25.7,37-40.3,75.8-44.4,114.3c-4.2,39.5,2.5,78.7,19.7,115.4
						c17.5,37.6,45.9,72.5,84.2,102.3c39,30.3,88.2,55,146.2,71.3c58.7,16.6,120.4,22.9,181.3,20c61-2.9,120.5-14.9,174.9-34.8
						c53.9-19.7,102.3-46.9,141.9-80.2C1154.5,656.1,1184.5,617.8,1202.7,575.4"/>
  
<path id="circle-2" class="st1 path" d="M1518,652.7c24.6-73.9,26.1-146.4,9.1-213.9c-16.4-64.8-49.9-125.1-96.8-178.2
						C1385,209.4,1327,164.7,1259,128.7c-66.1-35-153.5-114.8-237.7-131.5c-82.8-16.5-155.6,31-237.5,35.4
						C702,36.9,621.3,51,545.4,73.6c-76.8,22.9-149.8,54.8-214.6,94.9c-66.5,41.1-125.2,91.4-171.5,150.1
						c-48,60.9-78.3,125.7-91.2,191.1c-13.5,68.2-8.3,137.2,15.5,203c24.8,68.5,69.5,133.3,133.6,189.4
						c66.3,58,152.5,106.1,256.7,138.6c106.5,33.2,219.9,46.4,332.3,41.3c112.6-5,222.2-28.3,321.2-66.9
						c97.5-38,183.2-90.2,251.1-153.4C1444.3,800.5,1492.4,729.7,1518,652.7"/>
  
  <path id="circle-2-active" class="st1" d="M1518,652.7c24.6-73.9,26.1-146.4,9.1-213.9c-16.4-64.8-49.9-125.1-96.8-178.2
						C1385,209.4,1327,164.7,1259,128.7c-66.1-35-143.3-63-227.5-79.7c-82.8-16.5-165.8-20.8-247.7-16.4
						C702,36.9,621.3,51,545.4,73.6c-76.8,22.9-149.8,54.8-214.6,94.9c-66.5,41.1-125.2,91.4-171.5,150.1
						c-48,60.9-78.3,125.7-91.2,191.1c-13.5,68.2-8.3,137.2,15.5,203c24.8,68.5,69.5,133.3,133.6,189.4
						c66.3,58,152.5,106.1,256.7,138.6c106.5,33.2,219.9,46.4,332.3,41.3c112.6-5,222.2-28.3,321.2-66.9
						c97.5-38,183.2-90.2,251.1-153.4C1444.3,800.5,1492.4,729.7,1518,652.7"/>

</svg>
!

CSS 

              
                body {
 margin:0;
 background: #333;
}
svg {
  display: block;
  margin: 20px auto;
  width:500px;
}

#circle-1-active, #circle-2-active, #star{
  visibility:hidden;
}

#slider {
  width:420px;
  margin:20px auto;
}
!

JS 

              
                
var tl = new TimelineMax({onComplete:completeH}),
    circle1 = document.getElementById("circle-1"),
    circle2 = document.getElementById("circle-2"),
    outline = $(".path");

tl.fromTo(outline, 3, {drawSVG:"0%"}, {drawSVG:"100%"})
  .to(circle1, 0.5, {morphSVG:"#circle-1-active"}, 'start')
  .to(circle2, 0.5, {morphSVG:"#circle-2-active"}, 0)

  .add("back", 3.5)
  
  .to(circle1, 0.5, {morphSVG:"#circle-1", repeat:1, yoyo:true}, "back")
  .to(circle2, 0.5, {morphSVG:"#circle-2", repeat:1, yoyo:true}, "back")
  

function completeH(){
  tl.play("back")
}
!
999px

Console