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Feature lists are nice, but they can get lengthy and they don't always tell the story in a way that's relevant to you as the developer/designer in the trenches, trying to get real work done for real clients. You hear plenty about theoretical benefits of CSS animations or some whiz-bang library that claims to solve various challenges, but then you discover things fall apart in all but the most modern browsers or the API is exceedingly cumbersome or there are frustrating "gotchas". You need things to just work. .expander { cursor: pointer; font-weight: 400; position: relative; } section .card{ padding-bottom: 6px; margin-bottom: 10px; padding-left: 35px; padding-top: 6px; box-shadow: none; } .expandable-list { padding-left: 0; } .expandable-content { padding: 0; height: 0; overflow: hidden; } .expander-button { position: absolute; border-radius: 50%; background-color: #BBB; width: 15px; height: 15px; display: inline-block; vertical-align: middle; border: 1px solid #FFF; margin-top: 8px; /* vertically center with heading top: 50%; margin-top: -9px; */ left: -8px; margin-left: -18px; font-size: 0px; } .expander-plus, .expander-minus { position: absolute; background-color: #FFF; display: block; } .expander-plus { width: 1px; height: 7px; left: 6px; top: 3px; } .expander-minus { width: 7px; height: 1px; top: 6px; left: 3px; } .project-post p { font-family: "Lucida Grande", "Lucida Sans Unicode", Helvetica, Arial, Verdana, sans-serif; } .project-post h2 { padding-top: 16px; margin-bottom: 10px; } .expPoint, .project-post .expList li { font-size: 1.1em; list-style: none; line-height: normal; margin: 0px 0px 0px 8px; padding: 6px 4px 4px 20px; position:relative; border: 1px solid rgba(204,204,204,0); } .expPoint, .expContent { font-family: "Lucida Grande", "Lucida Sans Unicode", Helvetica, Arial, Verdana, sans-serif; } .expPoint:hover, .project-post .expList li:hover { background-color:white; border: 1px solid rgb(216,216,216); } .expContent { height: 0px; overflow: hidden; color: #656565; font-size: 0.9em; line-height: 150%; font-weight: normal; margin: 5px 0px 0px 0px; padding-top: 0px; } .toggle { width:6px; height:8px; position:absolute; background-image:url(/_img/toggle_arrow.gif); background-repeat: no-repeat; left: 9px; top: 12px; } .expMore { color: #71b200; text-decoration: underline; font-size:0.8em; } #featureAnimation, #featureBox { background-color:#000; border: 1px solid #333; height: 220px; overflow:hidden; line-height: normal; font-size: 80%; } #featureAnimation { position:relative; visibility:hidden; } #featureBox { position:absolute; } #featureAnimation, #featureBox, #whyGSAP, .featureTextGreen, .featureTextWhite { width: 838px; } #whyGSAP, .featureTextGreen, .featureTextWhite { text-align: center; } #whyGSAP, .featureTextGreen, .featureTextWhite { font-size:50px; position:absolute; font-family: "Lucida Grande", "Lucida Sans Unicode", Helvetica, Arial, Verdana, sans-serif; top:0; } .featureTextGreen { color:#91e600; font-weight: bold; } .featureTextWhite { color:white; font-weight:normal; } .star { position: absolute; width: 16px; height: 16px; display: none; } #browserIcons { top:64px; left: 100px; width: 92px; height: 92px; position: absolute; text-align:left; } #browserIcons img { position:absolute; } .featureTextMinor { color:#CCCCCC; font-weight:normal; font-size:20px; position:absolute; font-family: "Lucida Grande", "Lucida Sans Unicode", Helvetica, Arial, Verdana, sans-serif; visibility:hidden; } .dot { position:absolute; background-color: #91e600; } #ctrl_slider { position:absolute; width: 725px; height:10px; left:18px; top:196px; background: rgba(80,80,80,0.3); border:1px solid rgba(102,102,102,0.5); visibility:hidden; } Why GSAP? Performance Compatibility Other tools fall down in older browsers, but GSAP is remarkably compatible. Scale, rotate & move independently (impossible with CSS animations/transitions) XNJYHQLJYQEW CSS, canvas libraries, colors, beziers, etc. Total control pause(), play(), reverse(), or timeScale() any tween or sequence. GSAP The standard for HTML5 animation replay