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HTML

              
                <h1>Style Property Concept</h1>

<section>
  <div class="header">
    <button id="tween-1">Play</button>
    <div class="syntax">
      <div>TWEEN 1 - Element Style</div>
      <pre>TweenLite.to(target1, 1, { style: element1 });</pre>
    </div>
  </div>
  <div class="demo">
    <div id="element-1" class="element">element 1</div>
    <div id="target-1" class="target">target 1</div>
  </div>
</section>

<section>
  <div class="header">
    <button id="tween-2">Play</button>
    <div class="syntax">
      <div>TWEEN 2 - Blacklist Props</div>
      <pre>TweenLite.to(target2, 1, { style: element2, filterStyle: "-=backgroundColor,height" });</pre>
    </div>
  </div>
  <div class="demo">
    <div id="element-2" class="element">element 2</div>
    <div id="target-2" class="target">target 2</div>
  </div>
</section>

<section>
  <div class="header">
    <button id="tween-3">Play</button>
    <div class="syntax">
      <div>TWEEN 3 - Whitelist Props</div>
      <pre>TweenLite.to(target3, 1, { style: element3, filterStyle: "+=backgroundColor,height" });</pre>
    </div>
  </div>
  <div class="demo">
    <div id="element-3" class="element">element 3</div>
    <div id="target-3" class="target">target 3</div>
  </div>
</section>

<section>
  <div class="header">
    <button id="tween-4">Play</button>
    <div class="syntax">
      <div>TWEEN 4 - Overwrite Props</div>
      <pre>TweenLite.to(target4, 1, { style: element4, backgroundColor: "#2e8b57", rotation: -90 });</pre>
    </div>
  </div>
  <div class="demo">
    <div id="element-4" class="element">element 4</div>
    <div id="target-4" class="target">target 4</div>
  </div>
</section>

<section>
  <div class="header">
    <button id="tween-5">Play</button>
    <div class="syntax">
      <div>TWEEN 5 - CSS Rule</div>
      <pre>TweenLite.to(target5, 1, { style: ".rule-1" });</pre>
    </div>
  </div>
  <div class="demo">
    <div id="target-5" class="target">target 5</div>
    <div class="rule-box">
      <div>
        .rule-1 {<br>
        &nbsp; width: 225px;<br>
        &nbsp; height: 75px;<br>
        &nbsp; background-color: #2e8b57;<br>
        }
      </div>
    </div>
  </div>
</section>

<section>
  <div class="header">
    <button id="tween-6">Play</button>
    <div class="syntax">
      <div>TWEEN 6 - Multiple Styles</div>
      <pre>TweenLite.to(target6, 1, { style: [element6, ".rule-1", ".rule-2"], filterStyle: "-=x,y,rotation" });</pre>
    </div>
  </div>
  <div class="demo">
    <div id="element-6" class="element">element 6</div>
    <div id="target-6" class="target">target 6</div>
    <div class="rule-box">
      <div>
        .rule-1 {<br>
        &nbsp; width: 225px;<br>
        &nbsp; height: 75px;<br>
        &nbsp; background-color: #2e8b57;<br>
        }
      </div>
      <div>
        .rule-2 {<br>
        &nbsp; width: 125px;<br>
        &nbsp; height: 125px;<br>
        &nbsp; opacity: 0.5<br>
        }
      </div>
    </div>
  </div>
</section>
              
            
!

CSS

              
                body {
    margin: 40px;
    background-color: #eee;
}

*, *:before, *:after {
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

h1 {
    margin-bottom: 40px;
}

button {
    background-color: darkslateblue;
    color: white;
    padding: 12px 18px;
    border: none;
    box-shadow: 0 1px 4px 0 rgba(0, 0, 0, 0.3);
    cursor: pointer;
}

button:focus {
    outline: none;
}

section {
    position: relative;
    min-width: 1200px;
    margin: 0 0 75px;
    visibility: hidden;  
}

.header {
    display: flex;
    flex-direction: row;
    width: 100%;
    align-items: center;
    padding-bottom: 15px;
}

.syntax {
    flex: 1;
    margin-left: 15px;
}

.syntax div {
    font-weight: bold;
    font-size: 14px;
}

.syntax pre {
    font-size: 14px;
    margin: 4px 0 0;
}

.demo {
    border: 1px solid rgba(0, 0, 0, 0.3);
    position: relative;
    height: 250px;
}

.target,
.element {
    color: white;
    position: absolute;
    left: 0;
    top: 0;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 4px 0 rgba(0, 0, 0, 0.8);
    border: 1px solid transparent;
    outline: 1px solid transparent;
}

.target {
    background-color: cornflowerblue;
    z-index: 1;
    width: 150px;
    height: 150px;
}

.element {
    width: 100px;
    height: 100px;
    background-color: mediumvioletred;
    border-radius: 50%;
    transform: rotate(90deg);
}

.rule-box {
    display: flex;
    display: inline-flex;
    flex-direction: row;
}

.rule-box div {
    font-family: monospace;
    background-color: ghostwhite;
    box-shadow: 0 1px 4px 0 rgba(0, 0, 0, 0.5);
    margin-right: 8px;
    padding: 10px;
}

.rule-1 {
    width: 225px;
    height: 75px;
    background-color: #2e8b57;
}

.rule-2 {
    width: 125px;
    height: 125px;
    opacity: 0.5;
}

              
            
!

JS

              
                
TweenLite.set(".rule-box", { x: 525, y: 75 });
TweenLite.set(".element",  { x: 400, y: 75 });
TweenLite.set(".target",   { x: 15,  y: 15 });

var cssStyle = CSSExtender();

var element1 = $("#element-1"),
    element2 = $("#element-2"),
    element3 = $("#element-3"),
    element4 = $("#element-4"),
    element6 = $("#element-6");

var target1 = $("#target-1"),
    target2 = $("#target-2"),
    target3 = $("#target-3"),
    target4 = $("#target-4"),
    target5 = $("#target-5"),
    target6 = $("#target-6");

// Extend styles
var style1 = cssStyle.extend({
  target: target1,
  styles: element1
});

var style2 = cssStyle.extend({
  target: target2,
  styles: element2,
  filter: "-=backgroundColor,height"
});

var style3 = cssStyle.extend({
  target: target3,
  styles: element3,
  filter: "+=backgroundColor,height"
});

var style4 = cssStyle.extend({
  target: target4,
  styles: element4
});

var style5 = cssStyle.extend({
  styles: ".rule-1"
});

var style6 = cssStyle.extend({
  target: target6,
  styles: [element6, ".rule-1", ".rule-2"],
  filter: "-=x,y,rotation"
});

// Add a paused property to extended styles
var tween1 = TweenLite.to(target1, 1, _.assign(style1, { paused: true }));
var tween2 = TweenLite.to(target2, 1, _.assign(style2, { paused: true }));
var tween3 = TweenLite.to(target3, 1, _.assign(style3, { paused: true }));
var tween5 = TweenLite.to(target5, 1, _.assign(style5, { paused: true }));
var tween6 = TweenLite.to(target6, 1, _.assign(style6, { paused: true }));
var tween4 = TweenLite.to(target4, 1, _.assign(style4, {
  backgroundColor: "#2e8b57",
  rotation: -90,
  paused: true
}));

$("#tween-1").click(() => tween1.restart());
$("#tween-2").click(() => tween2.restart());
$("#tween-3").click(() => tween3.restart());
$("#tween-4").click(() => tween4.restart());
$("#tween-5").click(() => tween5.restart());
$("#tween-6").click(() => tween6.restart());

// Make content visible
TweenLite.set($("section"), { autoAlpha: 1 });


// ========================================================================
//  CSS EXTENDER
// ========================================================================
function CSSExtender() {

  var camelNames  = {};
  var kebabNames  = {};
  var prefixNames = ["-webkit-", "-moz-", "-ms-"];
  var removeNames = ["transform", "svg"]; 

  createCaseNames();

  return {
    extend: extend
  };

  // Basic functionality to extend CSS styles. Ignores vendor
  // prefixes, shorthand properties, and most transforms
  function extend(config) {

    var style     = {};
    var sources   = _.isArray(config.styles) ? config.styles : [config.styles];
    var target    = getElement(config.target);
    var listNames = getListNames(config.filter);
    var blackList = listNames.blackList;
    var whiteList = listNames.whiteList;

    _.forEach(sources, source => {

      var element = getElement(source);

      element && !whiteList
        ? _.assign(style, getDifference(target, element))
      	: _.assign(style, getStyle(element || source, whiteList));
    });

    return _.omit(style, blackList);
  }

  // Gets the style of a rule or element and filters the result
  // if a whiteList of names is provided
  function getStyle(source, whiteList) {

    var css, style = {};

    if (_.isElement(source)) css = window.getComputedStyle(source);
    if (_.isString(source))  css = CSSRulePlugin.getRule(source);
    if (!(css instanceof CSSStyleDeclaration)) return {};

    var length = whiteList ? whiteList.length : css.length;

    _.times(length, i => {
      var kebab = whiteList ? kebabNames[whiteList[i]] : css[i];
      var camel = camelNames[kebab];
      var value = css.getPropertyValue(kebab);
      if (camel && value) style[camel] = value;
    });

    return style;
  }

  // Converts the filter string into white and black listed names
  function getListNames(filter = "=") {

    var list  = filter.split("="); 
    var names = list[1].split(",");

    return {
      whiteList: list[0] === "+" ? names : null,
      blackList: list[0] === "-" ? names.concat(removeNames) : removeNames
    };
  }

  // Gets the different styles between two elements
  function getDifference(element1, element2) {

    if (!_.isElement(element1) || !_.isElement(element2)) return {};

    TweenLite.set([element1, element2], { y: "+=0" });

    var style  = {};
    var style1 = window.getComputedStyle(element1);
    var style2 = window.getComputedStyle(element2);

    var transform1 = element1._gsTransform;
    var transform2 = element2._gsTransform;

    // Find difference in GSAP transforms
    var transforms = _.omit(transform2, (value, name) => transform1[name] === value);

    // Find difference in CSS values
    _.forOwn(camelNames, (camelCase, name) => {
      var value1 = style1.getPropertyValue(name);
      var value2 = style2.getPropertyValue(name);
      if (value1 !== value2) style[camelCase] = value2;
    });

    return _.assign(style, transforms);
  }

  // Creates a list of CSS properties in camel and kebab case
  function createCaseNames() {

    var style = window.getComputedStyle(document.body);

    _.times(style.length, i => {
      var name = style[i];
      var inList = _.some(prefixNames, prefix => _.includes(name, prefix));
      if (!inList) camelNames[name] = _.camelCase(name);
    });

    kebabNames = _.invert(camelNames);
  }

  function getElement(value) {
    if (!value) return undefined;
    if (_.isElement(value)) return value;
    if (value.jquery) return value[0];
    return undefined;
  }
}
              
            
!
999px

Console