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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <link href='//fonts.googleapis.com/css?family=Signika+Negative:300,400,700' rel='stylesheet' type='text/css'>
<div id="demo">
  <div id="controls">
    <form id="form">
      <li style="padding-left:16px;">
        Engine:
        <select id="engine" size="1">
                <option value="shifty">Shifty (JS)</option>
                <option value="gsap">GSAP (JS)</option>
            </select>
      </li>
      <li>
        Properties:
        <select id="properties" size="1">
              <option value="normal">top, left, width, height</option>
              <option value="transforms">transform:translate(...) scale(...)</option>
            </select>
      </li>
      <li>
        Dots:
        <select id="dotQuantity" size="1">
                <option value="25">25</option>
                <option value="50">50</option>
                <option value="100">100</option>
                <option value="200">200</option>
                <option value="300">300</option>
                <option value="400">400</option>
                <option value="500" selected="selected">500</option>
                <option value="750">750</option>
                <option value="1000">1000</option>
                <option value="1250">1250</option>
                <option value="1500">1500</option>
                <option value="2000">2000</option>
                <option value="2500">2500</option>
                <option value="3000">3000</option>
            </select>
      </li>
      <li>
        <div id="start">START</div>
      </li>
    </form>
  </div>
  <div id="field">
    <div id="instructions">
      <h1>HTML5 Animation Speed Test</h1>
      <h2>
        Forked from <a href="https://codepen.io/GreenSock/pen/10a1790cf256ac78ad65d5cc52c39126" target="_blank">Greesock's original speed test</a>
      </h2>
      <p>Compare the animation performance of <a href="https://www.greensock.com/gsap-js/">GSAP</a> (GreenSock Animation Platform) and <a href="http://jeremyckahn.github.io/shifty/doc/">Shifty</a>. Select the options above and click "START". Crank up the
        number of dots until you see jerky behavior or clumps/rings. Also notice which properties animate faster: "top", "left", "width" and "height" or "transform: translate(...) scale(...)". You may be surprised.</p>
    </div>
  </div>
</div>
              
            
!

CSS

              
                body {
  background-color: black;
  margin:0;
  padding:0;
  color:#eee;
  font-family: Signika Negative, sans-serif;
  font-weight: 300;
  font-size: 1.15em;
  user-select:none;
  -webkit-user-select:none;
}
html, body {
  height: 100%;
  overflow:hidden;
}
h1 {
  font-weight: 400;
  font-size:2em;
  line-height:1em;
  margin-bottom:0.1em;
  color: white;
}
a, a:hover, a:visited {
  color:#71B200;
}
#controls {
  display:table-row;
  background-color:#555;
  background: linear-gradient(to bottom,  #777 0%,#444 100%);
  padding:10px 10px 10px 5px;
  z-index:1000;
}
#controls form li {
  display:table-cell;
  padding:12px 6px 10px 6px;
  vertical-align:middle;
  text-shadow: 1px 1px 1px #000;
}
#instructions {
  width:82%;
  margin-left:8%;
  padding-top:1em;
  line-height: 1.5em;
  color:#ccc;
}
#demo {
  display:table;
  width:100%;
  height:100%;
}
#field {
  position:relative;
  display:table-cell;
  width:100%;
  height: 100%;
  overflow:hidden;
  z-index:-100;
  border-top: 1px solid #777;
}
#start {
  color: black;
  border-radius: 6px;
  padding: 5px 18px;
  border: 2px solid black;
  background: #9af600;
  background: linear-gradient(to bottom,  #9af600 0%,#71B200 100%);
  cursor: pointer;
  text-shadow: none;
  font-weight: 400;
}
              
            
!

JS

              
                var $start = $("#start"),
  $dotQtyInput = $("#dotQuantity"),
  $engineInput = $("#engine"),
  $propertiesInput = $("#properties"),
  $instructions = $("#instructions"),
  $field = $("#field"),
  $window = $(window),
  $inputs = $("select"),
  inProgress = false,
  tests = {},
  duration,
  radius,
  centerX,
  centerY,
  dots,
  rawDots,
  currentTest,
  startingCSS;

//GSAP normal (top/left/width/height)
tests.gsap_normal = {
  milliseconds:false,
  wrapDot:function(dot) {
    return dot; //no wrapping necessary
  },
  tween:function(dot) {
    var angle = Math.random() * Math.PI * 2;
    dot.style.cssText = startingCSS;
    TweenLite.to(dot, duration, {css:{left:Math.cos(angle) * radius + centerX,
                                      top:Math.sin(angle) * radius + centerY,
                                      width:32,
                                      height:32},
                                 delay:Math.random() * duration,
                                 ease:Cubic.easeIn,
                                 overwrite:"none",
                                 onComplete:tests.gsap_normal.tween,
                                 onCompleteParams:[dot]});
  },
  stop:function(dot) {
    TweenLite.killTweensOf(dot);
  },
  nativeSize:false
};

//GSAP transforms (translate()/scale())
tests.gsap_transforms = {
  milliseconds:false,
  wrapDot:function(dot) {
    return dot; //no wrapping necessary
  },
  tween:function(dot) {
    var angle = Math.random() * Math.PI * 2;
    TweenLite.set(dot, {css:{x:0, y:0, scale:0.06}, overwrite:"none"});
    TweenLite.to(dot, duration, {css:{x:(Math.cos(angle) * radius),
                                      y:(Math.sin(angle) * radius),
                                      scaleX:2,
                                      scaleY:2,
                                      force3D:true},
                                 delay:Math.random() * duration,
                                 ease:Cubic.easeIn,
                                 overwrite:"none",
                                 onComplete:tests.gsap_transforms.tween,
                                 onCompleteParams:[dot]});
  },
  stop:function(dot) {
    TweenLite.killTweensOf(dot);
  },
  nativeSize:true
};

//Shifty normal (top/left/width/height)
tests.shifty_normal = {
  milliseconds: true,
  tween: function(dot) {
    var angle = Math.random() * Math.PI * 2;
    var dotStyle = dot.style;
    var size = 1;
    var startingCSS =
      "position:absolute; left:" +
      centerX +
      "px; top:" +
      centerY +
      "px; width:" +
      size +
      "px; height:" +
      size +
      "px;";
    dotStyle.cssText = startingCSS;

    var tweenable = new shifty.Tweenable();

    tweenable.setConfig({
      from: {
        left: centerX,
        top: centerY,
        width: 1,
        height: 1
      },
      to: {
        left: Math.cos(angle) * radius + centerX,
        top: Math.sin(angle) * radius + centerY,
        width: 32,
        height: 32
      },
      duration: duration,
      delay: Math.random() * duration,
      easing: "easeInCubic",
      step: function(state) {
        dotStyle.left = Math.round(state.left) + "px";
        dotStyle.top = Math.round(state.top) + "px";
        dotStyle.width = Math.round(state.width) + "px";
        dotStyle.height = Math.round(state.height) + "px";
      }
    });

    dot.tweenable = tweenable;

    tweenable
      .tween()
      .then(() => tests.shifty_normal.tween(dot))
      .catch(() => {});
  },
  stop: function(dot) {
    dot.tweenable.stop();
  },
  nativeSize: false
};

//Shifty transforms (translate()/scale())
tests.shifty_transforms = {
  milliseconds: true,
  tween: function(dot) {
    var angle = Math.random() * Math.PI * 2;
    var dotStyle = dot.style;
    var size = 16;
    var transform =
      "translate3d(" + centerX + "px," + centerY + "px,0) scale(0.06)";
    var startingCSS =
      "position:absolute; left:" +
      0 +
      "px; top:" +
      0 +
      "px; width:" +
      size +
      "px; height:" +
      size +
      "px; transform: " +
      transform;
    dotStyle.cssText = startingCSS;

    var tweenable = new shifty.Tweenable();

    tweenable.setConfig({
      from: {
        x: centerX,
        y: centerY,
        scale: 0.06
      },
      to: {
        x: Math.cos(angle) * radius + centerX,
        y: Math.sin(angle) * radius + centerY,
        scale: 2
      },
      duration: duration,
      delay: Math.random() * duration,
      easing: "easeInCubic",
      step: function({ x, y, scale }) {
        dotStyle.transform = `translate3d(${x}px, ${y}px, 0) scale(${scale})`;
      }
    });

    dot.tweenable = tweenable;

    tweenable
      .tween()
      .then(() => tests.shifty_transforms.tween(dot))
      .catch(() => {});
  },
  stop: function(dot) {
    dot.tweenable.stop();
  },
  nativeSize: false
};

function toggleTest() {
  var i, size;
  inProgress = !inProgress;
  if (inProgress) {
    $inputs.prop("disabled", true);
    $field.css({ pointerEvents: "none" }); //improve performance - ignore pointer events during animation
    $start.html(" STOP ");
    $start.css({ background: "#C00" });
    TweenLite.to($instructions, 0.7, { autoAlpha: 0, overwrite: "all" });
    currentTest = tests[$engineInput.val() + "_" + $propertiesInput.val()];
    size = currentTest.nativeSize ? "16px" : "1px";
    centerX = $field.width() / 2;
    centerY = $field.height() / 2;
    startingCSS =
      "position:absolute; left:" +
      centerX +
      "px; top:" +
      centerY +
      "px; width:" +
      size +
      "; height:" +
      size +
      ";";
    radius = Math.sqrt(centerX * centerX + centerY * centerY);
    duration = currentTest.milliseconds ? 750 : 0.75;
    //we wait a millisecond before creating the dots and starting to animate them so that the UI renders first (making the "start" button say "stop"), otherwise users could be confused when there's a long pause when you choose Zepto and transforms due to the fact that it can take a while for the browser to put all the dots on their own layers.
    setTimeout(function() {
      createDots();
      i = dots.length;
      while (--i > -1) {
        currentTest.tween(dots[i]);
      }
    }, 1);
  } else {
    $start.html(" START ");
    $start.css({
      backgroundColor: "#9af600",
      background: "linear-gradient(to bottom, #9af600 0%,#71B200 100%"
    });
    TweenLite.to($instructions, 0.7, { autoAlpha: 1, delay: 0.2 });
    $inputs.prop("disabled", false);
    $field.css({ pointerEvents: "auto" });
    //stop the tweens and remove the dots.
    i = dots.length;
    while (--i > -1) {
      currentTest.stop(dots[i]);
      $field[0].removeChild(rawDots[i]); //removes dot(s)
    }
    dots = null;
    rawDots = null;
  }
}

function createDots() {
  var i = parseInt($dotQtyInput.val()),
    dot;
  dots = [];
  rawDots = [];
  while (--i > -1) {
    dot = document.createElement("img");
    dot.src = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/16327/dot.png";
    dot.width = 1;
    dot.height = 1;
    dot.id = "dot" + i;
    dot.style.cssText = startingCSS;
    $field[0].appendChild(dot);
    rawDots.push(dot);
    dots.push(dot);
  }
}

$start.click(toggleTest);

              
            
!
999px

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