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HTML

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About the <head>

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!
Insecure Resource

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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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About Vendor Prefixing

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JavaScript

About JavaScript Preprocessors

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

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Babel includes JSX processing.

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Packages

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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.

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Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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HTML 

              
                <div class="floater-wrapper">
	<div class="floater">
		Here is some text in a floater.
	</div>	
</div>
<h2>Two examples of GSAP TimelineMax in action</h2>
<p>Open the console then click on the Squish button or the floating footer a few times.</p>
<p>Why does <b>resetTL()</b> think the first parameter is undefined ("Cannot read property 'progress' of undefined")? Note the string parameter - which I have included for reference - is working as expected, as you can see from the console.log output.</p>
 <section class="div_morphs">
	 <p>
	 	<button type="button" id="squish">Squish</button>
	 </p>
	 <div class="outer">
	 		<table>
	 		    <thead>
			 			<tr>
			 				<th>Name</th>
			 			</tr>
	 		    </thead>
	 		    <tbody>
			 			<tr>
			 				<td>Apple</td>
			 			</tr>
			 			<tr>
			 				<td>Banana</td>
			 			</tr>
			 			<tr>
			 				<td>Carrot</td>
			 			</tr>
			 			<tr>
			 				<td>Durian</td>
			 			</tr>
			 			<tr>
		 				  <td>Elderberry</td>
			 			</tr>
			 			<tr>
			 				<td>Fruit</td>
			 			</tr>
	 		    </tbody>
	 		</table>
	 </div>
</section>
!

CSS 

              
                body {
  margin: 30px;
  font-family: sans-serif;
  background-color: grey;
  position: relative;
}

table {
  background-color: white;
  border-collapse: collapse;
}

td, th {
  border: 1px solid black;
  padding: 5px 8px;
}

.outer {
  overflow: hidden;
}

.floater-wrapper {
  left: 0;
  right: 0;
  top: 0;
  position: fixed;
  bottom: 0;
  overflow: visible;
  pointer-events: none;
  z-index: 9;
}

.floater {
  position: absolute;
  background-color: lightgrey;
  padding: 15px 17px;
  box-sizing: border-box;
  width: 100%;
  bottom: 0;
  pointer-events: auto;
  cursor: pointer;
}

.floater:hover {
  background-color: green;
  color: white;
}
!

JS 

              
                // // For the table squish
var tl4 = new TimelineMax({ paused: true });
var tl5 = new TimelineMax({ paused: true });
var lastPlayed = null;

var tbl = $(".outer table");
tbl.attr("original_height", tbl.outerHeight());
tbl.attr("final_height", tbl.find("thead").outerHeight());

tl4.to(
  ".outer",
  0.5,
  { height: tbl.attr("final_height"), ease: Bounce.easeOut },
  "h0"
);

tl5.to(
  ".outer",
  0.5,
  { height: tbl.attr("original_height"), ease: Bounce.easeOut },
  "h1"
);

$("#squish").on("click", function(e) {
  if (tl4.isActive() || tl5.isActive()) {
    return;
  }

  if (lastPlayed !== tl4) {
    lastPlayed = tl4;
    tl4.play(0);
  } else {
    lastPlayed = tl5;
    tl5.play(0);
  }
});
!
999px

Console