GreenSock Easing with CSS linear() ⚡️

HTML

              
                <div id="app"></div>

CSS

              
                
:root {
	--accent: hsl(81, 97%, 41%);
	accent-color: var(--accent);
  --none: linear(0, 1);
  --quad-in: linear( 0, 0.0039, 0.0156, 0.0352, 0.0625, 0.0977, 0.1407, 0.1914, 0.2499, 0.3164, 0.3906 62.5%, 0.5625, 0.7656, 1 );
  --quad-out: linear( 0, 0.2342, 0.4374, 0.6093 37.49%, 0.6835, 0.7499, 0.8086, 0.8593, 0.9023, 0.9375, 0.9648, 0.9844, 0.9961, 1 );
  --quad-in-out: linear( 0, 0.0027, 0.0106 7.29%, 0.0425, 0.0957, 0.1701 29.16%, 0.2477, 0.3401 41.23%, 0.5982 55.18%, 0.7044 61.56%, 0.7987, 0.875 75%, 0.9297, 0.9687, 0.9922, 1 );
  --power-1-in: linear( 0, 0.0039, 0.0156, 0.0352, 0.0625, 0.0977, 0.1407, 0.1914, 0.2499, 0.3164, 0.3906 62.5%, 0.5625, 0.7656, 1 );
  --power-1-out: linear( 0, 0.2342, 0.4374, 0.6093 37.49%, 0.6835, 0.7499, 0.8086, 0.8593, 0.9023, 0.9375, 0.9648, 0.9844, 0.9961, 1 );
  --power-1-in-out: linear( 0, 0.0027, 0.0106 7.29%, 0.0425, 0.0957, 0.1701 29.16%, 0.2477, 0.3401 41.23%, 0.5982 55.18%, 0.7044 61.56%, 0.7987, 0.875 75%, 0.9297, 0.9687, 0.9922, 1 );
  --cubic-in: linear( 0, 0.0014 11.11%, 0.0071 19.24%, 0.0188 26.6%, 0.037 33.33%, 0.0634 39.87%, 0.0978 46.07%, 0.1407 52.02%, 0.1925 57.74%, 0.2559 63.49%, 0.3295 69.07%, 0.4135 74.5%, 0.5083 79.81%, 0.6141 85%, 0.7312 90.09%, 1 );
  --cubic-out: linear( 0, 0.2688 9.91%, 0.3859 15%, 0.4917 20.19%, 0.5865 25.5%, 0.6705 30.93%, 0.7441 36.51%, 0.8075 42.26%, 0.8593 47.98%, 0.9022 53.93%, 0.9366 60.13%, 0.963 66.67%, 0.9812 73.4%, 0.9929 80.76%, 0.9986 88.89%, 1 );
  --cubic-in-out: linear( 0, 0.0036 9.62%, 0.0185 16.66%, 0.0489 23.03%, 0.0962 28.86%, 0.1705 34.93%, 0.269 40.66%, 0.3867 45.89%, 0.5833 52.95%, 0.683 57.05%, 0.7829 62.14%, 0.8621 67.46%, 0.8991 70.68%, 0.9299 74.03%, 0.9545 77.52%, 0.9735 81.21%, 0.9865 85%, 0.9949 89.15%, 1 );
  --power-2-in: linear( 0, 0.0014 11.11%, 0.0071 19.24%, 0.0188 26.6%, 0.037 33.33%, 0.0634 39.87%, 0.0978 46.07%, 0.1407 52.02%, 0.1925 57.74%, 0.2559 63.49%, 0.3295 69.07%, 0.4135 74.5%, 0.5083 79.81%, 0.6141 85%, 0.7312 90.09%, 1 );
  --power-2-out: linear( 0, 0.2688 9.91%, 0.3859 15%, 0.4917 20.19%, 0.5865 25.5%, 0.6705 30.93%, 0.7441 36.51%, 0.8075 42.26%, 0.8593 47.98%, 0.9022 53.93%, 0.9366 60.13%, 0.963 66.67%, 0.9812 73.4%, 0.9929 80.76%, 0.9986 88.89%, 1 );
  --power-2-in-out: linear( 0, 0.0036 9.62%, 0.0185 16.66%, 0.0489 23.03%, 0.0962 28.86%, 0.1705 34.93%, 0.269 40.66%, 0.3867 45.89%, 0.5833 52.95%, 0.683 57.05%, 0.7829 62.14%, 0.8621 67.46%, 0.8991 70.68%, 0.9299 74.03%, 0.9545 77.52%, 0.9735 81.21%, 0.9865 85%, 0.9949 89.15%, 1 );
  --quart-in: linear( 0, 0.0039 25%, 0.0117 32.89%, 0.0248 39.68%, 0.0457 46.22%, 0.0743 52.21%, 0.1113 57.77%, 0.1575 63%, 0.218 68.33%, 0.2901 73.39%, 0.3745 78.23%, 0.4718 82.88%, 0.5827 87.37%, 0.7074 91.71%, 0.8462 95.91%, 1 );
  --quart-out: linear( 0, 0.1538 4.09%, 0.2926 8.29%, 0.4173 12.63%, 0.5282 17.12%, 0.6255 21.77%, 0.7099 26.61%, 0.782 31.67%, 0.8425 37%, 0.8887 42.23%, 0.9257 47.79%, 0.9543 53.78%, 0.9752 60.32%, 0.9883 67.11%, 0.9961 75%, 1 );
  --quart-in-out: linear( 0, 0.0029 13.8%, 0.0184 21.9%, 0.0339 25.51%, 0.0551 28.81%, 0.0827 31.88%, 0.1168 34.76%, 0.1962 39.57%, 0.3005 44.02%, 0.4084 47.53%, 0.6242 53.45%, 0.7493 57.93%, 0.8495 62.97%, 0.8888 65.67%, 0.9213 68.51%, 0.9629 73.9%, 0.9876 80.16%, 0.998 87.5%, 1 );
  --power-3-in: linear( 0, 0.0039 25%, 0.0117 32.89%, 0.0248 39.68%, 0.0457 46.22%, 0.0743 52.21%, 0.1113 57.77%, 0.1575 63%, 0.218 68.33%, 0.2901 73.39%, 0.3745 78.23%, 0.4718 82.88%, 0.5827 87.37%, 0.7074 91.71%, 0.8462 95.91%, 1 );
  --power-3-out: linear( 0, 0.1538 4.09%, 0.2926 8.29%, 0.4173 12.63%, 0.5282 17.12%, 0.6255 21.77%, 0.7099 26.61%, 0.782 31.67%, 0.8425 37%, 0.8887 42.23%, 0.9257 47.79%, 0.9543 53.78%, 0.9752 60.32%, 0.9883 67.11%, 0.9961 75%, 1 );
  --power-3-in-out: linear( 0, 0.0029 13.8%, 0.0184 21.9%, 0.0339 25.51%, 0.0551 28.81%, 0.0827 31.88%, 0.1168 34.76%, 0.1962 39.57%, 0.3005 44.02%, 0.4084 47.53%, 0.6242 53.45%, 0.7493 57.93%, 0.8495 62.97%, 0.8888 65.67%, 0.9213 68.51%, 0.9629 73.9%, 0.9876 80.16%, 0.998 87.5%, 1 );
  --quint-in: linear( 0, 0.0024 29.91%, 0.008 38.03%, 0.0179 44.72%, 0.035 51.16%, 0.0595 56.88%, 0.0922 62.08%, 0.1338 66.88%, 0.1914 71.85%, 0.262 76.5%, 0.3461 80.88%, 0.4447 85.04%, 0.5587 89.01%, 0.689 92.82%, 0.8359 96.48%, 1 );
  --quint-out: linear( 0, 0.1641 3.52%, 0.311 7.18%, 0.4413 10.99%, 0.5553 14.96%, 0.6539 19.12%, 0.738 23.5%, 0.8086 28.15%, 0.8662 33.12%, 0.9078 37.92%, 0.9405 43.12%, 0.965 48.84%, 0.9821 55.28%, 0.992 61.97%, 0.9976 70.09%, 1 );
  --quint-in-out: linear( 0, 0.0012 14.95%, 0.0089 22.36%, 0.0297 28.43%, 0.0668 33.43%, 0.0979 36.08%, 0.1363 38.55%, 0.2373 43.07%, 0.3675 47.01%, 0.5984 52.15%, 0.7121 55.23%, 0.8192 59.21%, 0.898 63.62%, 0.9297 66.23%, 0.9546 69.06%, 0.9733 72.17%, 0.9864 75.67%, 0.9982 83.73%, 1 );
  --power-4-in: linear( 0, 0.0024 29.91%, 0.008 38.03%, 0.0179 44.72%, 0.035 51.16%, 0.0595 56.88%, 0.0922 62.08%, 0.1338 66.88%, 0.1914 71.85%, 0.262 76.5%, 0.3461 80.88%, 0.4447 85.04%, 0.5587 89.01%, 0.689 92.82%, 0.8359 96.48%, 1 );
  --power-4-out: linear( 0, 0.1641 3.52%, 0.311 7.18%, 0.4413 10.99%, 0.5553 14.96%, 0.6539 19.12%, 0.738 23.5%, 0.8086 28.15%, 0.8662 33.12%, 0.9078 37.92%, 0.9405 43.12%, 0.965 48.84%, 0.9821 55.28%, 0.992 61.97%, 0.9976 70.09%, 1 );
  --power-4-in-out: linear( 0, 0.0012 14.95%, 0.0089 22.36%, 0.0297 28.43%, 0.0668 33.43%, 0.0979 36.08%, 0.1363 38.55%, 0.2373 43.07%, 0.3675 47.01%, 0.5984 52.15%, 0.7121 55.23%, 0.8192 59.21%, 0.898 63.62%, 0.9297 66.23%, 0.9546 69.06%, 0.9733 72.17%, 0.9864 75.67%, 0.9982 83.73%, 1 );
  --strong-in: linear( 0, 0.0024 29.91%, 0.008 38.03%, 0.0179 44.72%, 0.035 51.16%, 0.0595 56.88%, 0.0922 62.08%, 0.1338 66.88%, 0.1914 71.85%, 0.262 76.5%, 0.3461 80.88%, 0.4447 85.04%, 0.5587 89.01%, 0.689 92.82%, 0.8359 96.48%, 1 );
  --strong-out: linear( 0, 0.1641 3.52%, 0.311 7.18%, 0.4413 10.99%, 0.5553 14.96%, 0.6539 19.12%, 0.738 23.5%, 0.8086 28.15%, 0.8662 33.12%, 0.9078 37.92%, 0.9405 43.12%, 0.965 48.84%, 0.9821 55.28%, 0.992 61.97%, 0.9976 70.09%, 1 );
  --strong-in-out: linear( 0, 0.0012 14.95%, 0.0089 22.36%, 0.0297 28.43%, 0.0668 33.43%, 0.0979 36.08%, 0.1363 38.55%, 0.2373 43.07%, 0.3675 47.01%, 0.5984 52.15%, 0.7121 55.23%, 0.8192 59.21%, 0.898 63.62%, 0.9297 66.23%, 0.9546 69.06%, 0.9733 72.17%, 0.9864 75.67%, 0.9982 83.73%, 1 );
  --elastic-in: linear( 0, 0.0019 13.34%, -0.0056 27.76%, -0.0012 31.86%, 0.0147 39.29%, 0.0161 42.46%, 0.0039 46.74%, -0.0416 54.3%, -0.046 57.29%, -0.0357, -0.0122 61.67%, 0.1176 69.29%, 0.1302 70.79%, 0.1306 72.16%, 0.1088 74.09%, 0.059 75.99%, -0.0317 78.19%, -0.3151 83.8%, -0.3643 85.52%, -0.3726, -0.3705 87.06%, -0.3463, -0.2959 89.3%, -0.1144 91.51%, 0.7822 97.9%, 1 );
  --elastic-out: linear( 0, 0.2178 2.1%, 1.1144 8.49%, 1.2959 10.7%, 1.3463 11.81%, 1.3705 12.94%, 1.3726, 1.3643 14.48%, 1.3151 16.2%, 1.0317 21.81%, 0.941 24.01%, 0.8912 25.91%, 0.8694 27.84%, 0.8698 29.21%, 0.8824 30.71%, 1.0122 38.33%, 1.0357, 1.046 42.71%, 1.0416 45.7%, 0.9961 53.26%, 0.9839 57.54%, 0.9853 60.71%, 1.0012 68.14%, 1.0056 72.24%, 0.9981 86.66%, 1 );
  --elastic-in-out: linear( 0, 0.0009 8.51%, -0.0047 19.22%, 0.0016 22.39%, 0.023 27.81%, 0.0237 30.08%, 0.0144 31.81%, -0.0051 33.48%, -0.1116 39.25%, -0.1181 40.59%, -0.1058 41.79%, -0.0455, 0.0701 45.34%, 0.9702 55.19%, 1.0696 56.97%, 1.0987 57.88%, 1.1146 58.82%, 1.1181 59.83%, 1.1092 60.95%, 1.0057 66.48%, 0.986 68.14%, 0.9765 69.84%, 0.9769 72.16%, 0.9984 77.61%, 1.0047 80.79%, 0.9991 91.48%, 1 );
  --bounce-in: linear( 0, 0.0117, 0.0156, 0.0117, 0, 0.0273, 0.0468, 0.0586, 0.0625, 0.0586, 0.0468, 0.0273, 0 27.27%, 0.1093, 0.1875 36.36%, 0.2148, 0.2343, 0.2461, 0.25, 0.2461, 0.2344, 0.2148 52.28%, 0.1875 54.55%, 0.1095, 0, 0.2341, 0.4375, 0.6092, 0.75, 0.8593, 0.9375 90.91%, 0.9648, 0.9843, 0.9961, 1 );
  --bounce-out: linear( 0, 0.0039, 0.0157, 0.0352, 0.0625 9.09%, 0.1407, 0.25, 0.3908, 0.5625, 0.7654, 1, 0.8907, 0.8125 45.45%, 0.7852, 0.7657, 0.7539, 0.75, 0.7539, 0.7657, 0.7852, 0.8125 63.64%, 0.8905, 1 72.73%, 0.9727, 0.9532, 0.9414, 0.9375, 0.9414, 0.9531, 0.9726, 1, 0.9883, 0.9844, 0.9883, 1 );
  --bounce-in-out: linear( 0, 0.0078, 0, 0.0235, 0.0313, 0.0235, 0.0001 13.63%, 0.0549 15.92%, 0.0938, 0.1172, 0.125, 0.1172, 0.0939 27.26%, 0.0554 29.51%, 0.0003 31.82%, 0.2192, 0.3751 40.91%, 0.4332, 0.4734 45.8%, 0.4947 48.12%, 0.5027 51.35%, 0.5153 53.19%, 0.5437, 0.5868 57.58%, 0.6579, 0.7504 62.87%, 0.9999 68.19%, 0.9453, 0.9061, 0.8828, 0.875, 0.8828, 0.9063, 0.9451 84.08%, 0.9999 86.37%, 0.9765, 0.9688, 0.9765, 1, 0.9922, 1 );
  --expo-in: linear( 0, 0.0085 31.26%, 0.0167 40.94%, 0.0289 48.86%, 0.0471 55.92%, 0.0717 61.99%, 0.1038 67.32%, 0.1443 72.07%, 0.1989 76.7%, 0.2659 80.89%, 0.3465 84.71%, 0.4419 88.22%, 0.554 91.48%, 0.6835 94.51%, 0.8316 97.34%, 1 );
  --expo-out: linear( 0, 0.1684 2.66%, 0.3165 5.49%, 0.446 8.52%, 0.5581 11.78%, 0.6535 15.29%, 0.7341 19.11%, 0.8011 23.3%, 0.8557 27.93%, 0.8962 32.68%, 0.9283 38.01%, 0.9529 44.08%, 0.9711 51.14%, 0.9833 59.06%, 0.9915 68.74%, 1 );
  --expo-in-out: linear( 0, 0.0053 17.18%, 0.0195 26.59%, 0.0326 30.31%, 0.0506 33.48%, 0.0744 36.25%, 0.1046 38.71%, 0.1798 42.62%, 0.2846 45.93%, 0.3991 48.37%, 0.6358 52.29%, 0.765 55.45%, 0.8622 59.3%, 0.8986 61.51%, 0.9279 63.97%, 0.9481 66.34%, 0.9641 69.01%, 0.9856 75.57%, 0.9957 84.37%, 1 );
  --circ-in: linear( -0, 0.0048 9.8%, 0.0192 19.5%, 0.043 29.02%, 0.0761 38.26%, 0.1181 47.13%, 0.1685 55.56%, 0.227 63.44%, 0.2929 70.71%, 0.3656 77.3%, 0.4445 83.15%, 0.5285 88.19%, 0.6173 92.39%, 0.7099 95.7%, 0.805 98.08%, 0.9021 99.52%, 1 );
  --circ-out: linear( 0, 0.0979 0.48%, 0.195 1.92%, 0.2901 4.3%, 0.3827 7.61%, 0.4715 11.81%, 0.5555 16.85%, 0.6344 22.7%, 0.7071 29.29%, 0.773 36.56%, 0.8315 44.44%, 0.8819 52.87%, 0.9239 61.74%, 0.957 70.98%, 0.9808 80.5%, 0.9952 90.2%, 1 );
  --circ-in-out: linear( -0, 0.0033 5.75%, 0.0132 11.43%, 0.0296 16.95%, 0.0522 22.25%, 0.0808 27.25%, 0.1149 31.89%, 0.1542 36.11%, 0.1981 39.85%, 0.2779 44.79%, 0.3654 48.15%, 0.4422 49.66%, 0.5807 50.66%, 0.6769 53.24%, 0.7253 55.37%, 0.7714 58.01%, 0.8142 61.11%, 0.8536 64.65%, 0.9158 72.23%, 0.9619 80.87%, 0.9904 90.25%, 1 );
  --sine-in: linear( 0, 0.0035, 0.0141 10.7%, 0.0318 16.09%, 0.0566 21.51%, 0.0885 26.98%, 0.1278 32.53%, 0.2288 43.93%, 0.3563 55.48%, 0.5171 67.92%, 0.7139 81.53%, 1 );
  --sine-out: linear( 0, 0.2861 18.47%, 0.4829 32.08%, 0.6437 44.52%, 0.7712 56.07%, 0.8722 67.47%, 0.9115 73.02%, 0.9434 78.49%, 0.9682 83.91%, 0.9859 89.3%, 0.9965, 1 );
  --sine-in-out: linear( 0, 0.007 5.35%, 0.0282 10.75%, 0.0638 16.26%, 0.1144 21.96%, 0.1833 28.16%, 0.2717 34.9%, 0.6868 62.19%, 0.775 68.54%, 0.8457 74.3%, 0.9141 81.07%, 0.9621 87.52%, 0.9905 93.8%, 1 );
  --back-in: linear( 0, -0.0029 4.31%, -0.0119 9.02%, -0.0838 31.27%, -0.0956 36.64%, -0.1 41.45%, -0.0953 47.03%, -0.0792 52.25%, -0.0512 57.19%, -0.0111 61.92%, 0.0512 67.19%, 0.131 72.27%, 0.2284 77.18%, 0.3443 81.96%, 0.479 86.62%, 0.6329 91.17%, 0.8065 95.63%, 1 );
  --back-out: linear( 0, 0.1935 4.37%, 0.3671 8.83%, 0.521 13.38%, 0.6557 18.04%, 0.7716 22.82%, 0.869 27.73%, 0.9488 32.81%, 1.0111 38.08%, 1.0512 42.81%, 1.0792 47.75%, 1.0953 52.97%, 1.1 58.55%, 1.0956 63.36%, 1.0838 68.73%, 1.0119 90.98%, 1.0029 95.69%, 1 );
  --back-in-out: linear( 0, -0.0077 5.2%, -0.0452 16.98%, -0.0493 22.35%, -0.0418 25.57%, -0.0258 28.57%, -0.0007 31.42%, 0.0335 34.15%, 0.1242 39.03%, 0.2505 43.65%, 0.3844 47.35%, 0.656 53.68%, 0.81 58.37%, 0.9282 63.52%, 0.9719 66.23%, 1.0055 69.04%, 1.0255 71.4%, 1.0396 73.87%, 1.0477 76.48%, 1.05 79.27%, 1.0419 84.36%, 1.0059 95.49%, 1 );
}

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

body {
	display: grid;
	place-items: center;
	min-height: 100vh;
	font-family:  "SF Pro Text", "SF Pro Icons", "AOS Icons", "Helvetica Neue", Helvetica, Arial, sans-serif, system-ui;
}

.container {
	width: 50vmin;
	min-width: 300px;
	aspect-ratio: 1;
	background: hsl(0 0% 96%);
	position: relative;
	background: hsl(0 0% 90%);
	border-radius: 5vmin;
	container-type: inline-size;
	transform: rotateY(calc(var(--show-code, 0) * 180deg));
	transition: transform 0.2s;
}

select {
	padding: 0.5rem 1rem;
}

main * {
	transform-style: preserve-3d;
}

main {
	transform-style: preserve-3d;
	perspective: 100vmin;
	display: grid;
	place-items: center;
	gap: 8rem;
}

.controls {
	display: grid;
	grid-template-columns: auto auto;
	gap: 1rem 2rem;
	align-items: center;
	font-weight: bold;
}

.flipper {
	position: absolute;
	top: 5%;
	right: 5%;
	width: 48px;
	aspect-ratio: 1;
	border-radius: 50%;
	border: 0;
	color: hsl(0 0% 10%);
	padding: 0;
	z-index: 10;
	display: grid;
	place-items: center;
	cursor: pointer;
	background: transparent;
}

button {
	transition: color 0.2s;
}

::selection {
	background: hsl(81 97% 41% / 0.5);
}

.container-wrap--flipped button {
	color: hsl(0 0% 90%);
}


.flipper[aria-pressed=true] path:first-of-type,
.flipper[aria-pressed=false] path:last-of-type {
	display: none;
}

.container-wrap button:is(:hover, :focus-visible) {
	background: hsl(0 0% 80%);
}
.container-wrap--flipped button:is(:hover, :focus-visible) {
	background: hsl(0 0% 40%);
}

button svg {
	width: 75%;
}

.replay {
	position: absolute;
	bottom: 5%;
	left: 5%;
	z-index: 10;
	width: 48px;
	aspect-ratio: 1;
	border-radius: 50%;
	border: 0;
	background: transparent;
	padding: 0;
	cursor: pointer;
	display: grid;
	place-items: center;
	scale: calc(1 - var(--show-code, 0));
	transition: color 0.2s, scale 0.2s;
}

.replay svg {
	width: 65%;
}

.container-wrap {
	position: relative;
}

.box {
	font-size: 10cqi;
	font-weight: bold;
	line-height: 1;
	translate: 0 -50%;
	position: absolute;
	animation-duration: calc(((1 - var(--show-code, 0)) * var(--speed, 2)) * 1s);
	animation-fill-mode: both;
	animation-timing-function: var(--ease, var(--none));
}

.front {
	position: absolute;
	inset: 0;
	translate: 0 0;
}

pre {
	display: flex;
	flex-direction: column;
	justify-content: center;
}

.code-panel {
	position: absolute;
	opacity: 1;
	inset: 0;
	font-weight: bold;
	border-radius: 5vmin;
	overflow: hidden;
	transform: rotateY(180deg);
	backface-visibility: hidden;
}

.box.ltr {
	top: 50%;
	left: 0;
	animation-name: ltr;
}

@keyframes ltr {
	0% {
		translate: 0 -50%;
	}
	50%, 100% {
		translate: calc(100cqi - 100%) -50%;
	}
}

.box.rtl {
	top: 50%;
	left: 0;
	animation-name: rtl;
}

@keyframes rtl {
	0% {
		translate: calc(100cqi - 100%) -50%;
	}
	50%, 100% {
		translate: 0 -50%;
	}
}

.box.ttb {
	top: 0;
	left: 50%;
	animation-name: ttb;
}

@keyframes ttb {
	0% {
		translate: -50% 0;
	}
	50%, 100% {
		translate: -50% calc(100cqi - 100%);
	}
}

.box.btt {
	top: 0;
	left: 50%;
	animation-name: btt;
}

@keyframes btt {
	0% {
		translate: -50% calc(100cqi - 100%);
	}
	50%, 100% {
		translate: -50% 0;
	}
}

.box.si {
	top: 50%;
	left: 50%;
	translate: -50% -50%;
	animation-name: si;
}

@keyframes si {
	0% {
		scale: 0;
	}
	50%, 100% {
		scale: 1;
	}
}

.box.so {
	top: 50%;
	left: 50%;
	translate: -50% -50%;
	animation-name: so;
}

@keyframes so {
	0% {
		scale: 1;
	}
	50%, 100% {
		scale: 0;
	}
}

.box.sd {
	top: 50%;
	left: 50%;
	translate: -50% -50%;
	animation-name: sd;
}

@keyframes sd {
	0% {
		scale: 1;
	}
	50%, 100% {
		scale: 0.5;
	}
}

.box.su {
	top: 50%;
	left: 50%;
	translate: -50% -50%;
	animation-name: su;
}

@keyframes su {
	0% {
		scale: 1;
	}
	50%, 100% {
		scale: 2;
	}
}

/* All the Prism JS styling */
/* PrismJS 1.23.0
https://prismjs.com/download.html#themes=prism-tomorrow&languages=css+css-extras&plugins=line-numbers+inline-color+toolbar+copy-to-clipboard */
/**
 * prism.js tomorrow night eighties for JavaScript, CoffeeScript, CSS and HTML
 * Based on https://github.com/chriskempson/tomorrow-theme
 * @author Rose Pritchard
 */

code[class*="language-"],
pre[class*="language-"] {
  color: #ccc;
  background: none;
  font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
  font-size: 1em;
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 1.5;

  -moz-tab-size: 4;
  -o-tab-size: 4;
  tab-size: 4;

  -webkit-hyphens: none;
  -moz-hyphens: none;
  -ms-hyphens: none;
  hyphens: none;

}

/* Code blocks */
pre[class*="language-"] {
  padding: 2rem;
  margin: 0;
  overflow: auto;
  outline: transparent;
}

:not(pre) > code[class*="language-"],
pre[class*="language-"] {
  background: #2d2d2d;
}

/* Inline code */
:not(pre) > code[class*="language-"] {
  padding: .1em;
  border-radius: .3em;
  white-space: normal;
}

pre {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.token.comment,
.token.block-comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #999;
}

.token.punctuation {
  color: #ccc;
}

.token.tag,
.token.attr-name,
.token.namespace,
.token.deleted {
  color: #e2777a;
}

.token.function-name {
  color: #6196cc;
}

.token.boolean,
.token.number,
.token.function {
  color: #f08d49;
}

.token.property,
.token.class-name,
.token.constant,
.token.symbol {
  color: #f8c555;
}

.token.selector,
.token.important,
.token.atrule,
.token.keyword,
.token.builtin {
  color: #cc99cd;
}

.token.string,
.token.char,
.token.attr-value,
.token.regex,
.token.variable {
  color: #7ec699;
}

.token.operator,
.token.entity,
.token.url {
  color: #67cdcc;
}

.token.important,
.token.bold {
  font-weight: bold;
}
.token.italic {
  font-style: italic;
}

.token.entity {
  cursor: help;
}

.token.inserted {
  color: green;
}

pre[class*="language-"].line-numbers {
  position: relative;
  padding-left: 3.8em;
  counter-reset: linenumber;
}

pre[class*="language-"].line-numbers > code {
  position: relative;
  white-space: inherit;
}

.line-numbers .line-numbers-rows {
  position: absolute;
  pointer-events: none;
  top: 0;
  font-size: 100%;
  left: -3.8em;
  width: 3em; /* works for line-numbers below 1000 lines */
  letter-spacing: -1px;
  border-right: 1px solid #999;

  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;

}

  .line-numbers-rows > span {
    display: block;
    counter-increment: linenumber;
  }

    .line-numbers-rows > span:before {
      content: counter(linenumber);
      color: #999;
      display: block;
      padding-right: 0.8em;
      text-align: right;
    }

span.inline-color-wrapper {
  /*
   * The background image is the following SVG inline in base 64:
   *
   * <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 2 2">
   *     <path fill="gray" d="M0 0h2v2H0z"/>
   *     <path fill="white" d="M0 0h1v1H0zM1 1h1v1H1z"/>
   * </svg>
   *
   * SVG-inlining explained:
   * https://stackoverflow.com/a/21626701/7595472
   */
  background: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyIDIiPjxwYXRoIGZpbGw9ImdyYXkiIGQ9Ik0wIDBoMnYySDB6Ii8+PHBhdGggZmlsbD0id2hpdGUiIGQ9Ik0wIDBoMXYxSDB6TTEgMWgxdjFIMXoiLz48L3N2Zz4=");
  /* This is to prevent visual glitches where one pixel from the repeating pattern could be seen. */
  background-position: center;
  background-size: 110%;

  display: inline-block;
  height: 1.333ch;
  width: 1.333ch;
  margin: 0 .333ch;
  box-sizing: border-box;
  border: 1px solid white;
  outline: 1px solid rgba(0,0,0,.5);
  overflow: hidden;
}

span.inline-color {
  display: block;
  /* To prevent visual glitches again */
  height: 120%;
  width: 120%;
}

div.code-toolbar {
  height: 100%;
  position: relative;
}

div.code-toolbar > .toolbar {
  position: absolute;
  top: .3em;
  right: .2em;
  opacity: 1;
}

div.code-toolbar:hover > .toolbar {
  opacity: 1;
}

/* Separate line b/c rules are thrown out if selector is invalid.
   IE11 and old Edge versions don't support :focus-within. */
div.code-toolbar:focus-within > .toolbar {
  opacity: 1;
}

div.code-toolbar > .toolbar .toolbar-item {
  display: inline-block;
}

div.code-toolbar > .toolbar a {
  cursor: pointer;
}

div.code-toolbar > .toolbar button {
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  line-height: normal;
  overflow: visible;
  padding: 0;
  -webkit-user-select: none; /* for button */
  -moz-user-select: none;
  -ms-user-select: none;
}

div.code-toolbar > .toolbar a,
div.code-toolbar > .toolbar button {
  color: #bbb;
  font-size: 1rem;
  padding: 0.5rem;
  font-family: sans-serif;
  background: hsl(0, 0%, 25%);
  border-radius: .5em;
  outline: transparent;
  cursor: pointer;
}

div.code-toolbar > .toolbar a:hover,
div.code-toolbar > .toolbar a:focus,
div.code-toolbar > .toolbar button:hover,
div.code-toolbar > .toolbar button:focus,
div.code-toolbar > .toolbar span:hover,
div.code-toolbar > .toolbar span:focus {
  background: hsl(0, 0%, 40%);
  text-decoration: none;
}


/* Code theming */
code {
	max-width: 50vmin;
}

JS

              
                import Prism from 'https://cdn.skypack.dev/prismjs'
import React from 'https://cdn.skypack.dev/react'
import { render } from 'https://cdn.skypack.dev/react-dom'

const keys = [
  'none',
  'quad',
  'power-1',
  'power-2',
  'power-3',
  'power-4',
  'cubic',
  'quart',
  'quint',
  'strong',
  'elastic',
  'bounce',
  'expo',
  'circ',
  'sine',
  'back',
]

const getCode = (key, speed) => {
  const ease = getComputedStyle(document.documentElement).getPropertyValue(`--${key}`)
  console.info({ ease, key })
  let chunks = '\n    '

  for (let i = 0; i < ease.split(',').length; i+=5) {
    chunks += `${ease.split(',').slice(i, i + 5).join(',')}${i >= ease.split(',').length - 5 ? '' : ','}${i >= ease.split(',').length - 5 ? ';' : '\n'}      `
  }
  // --${key}: ${ease.split(',').join(',\n    ')};
  return `:root {
  --${key}: ${chunks}
  --speed: ${speed}s;
}
  `
}

const App = () => {
  const [ease, setEase] = React.useState('elastic-in')
  const [speed, setSpeed] = React.useState(2)
  const [animation, setAnimation] = React.useState('su')
  const [flipped, setFlipped] = React.useState(false)
  const [replayKey, setReplayKey] = React.useState(Date.now)
  const cssRef = React.useRef(Prism.highlight(getCode(ease, speed), Prism.languages.css, 'css'))

  const changeEase = (event) => {
    cssRef.current = Prism.highlight(getCode(event.target.value, speed), Prism.languages.css, 'css')
    setEase(event.target.value)
  }
  const changeAnimation = (event) => {
    setAnimation(event.target.value)
  }
  const changeSpeed = (event) => {
    cssRef.current = Prism.highlight(getCode(ease, event.target.value), Prism.languages.css, 'css')
    setSpeed(event.target.value)
  }
  const flip = () => {
    setFlipped(!flipped)
  }

  const replay = () => {
    setReplayKey(Date.now)
  }

  return (
    <main>
      <div className={`container-wrap ${flipped ? 'container-wrap--flipped' : ''}`} style={{'--show-code': flipped ? 1 : 0}}>
        <button className="flipper" onClick={flip} aria-pressed={flipped} title={flipped ? 'Show Animation' : 'Show CSS'}>
          <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" strokeWidth={1.5} stroke="currentColor" className="w-6 h-6">
            <path strokeLinecap="round" strokeLinejoin="round" d="M14.25 9.75L16.5 12l-2.25 2.25m-4.5 0L7.5 12l2.25-2.25M6 20.25h12A2.25 2.25 0 0020.25 18V6A2.25 2.25 0 0018 3.75H6A2.25 2.25 0 003.75 6v12A2.25 2.25 0 006 20.25z" />
            <path strokeLinecap="round" strokeLinejoin="round" d="M3.375 19.5h17.25m-17.25 0a1.125 1.125 0 01-1.125-1.125M3.375 19.5h1.5C5.496 19.5 6 18.996 6 18.375m-3.75 0V5.625m0 12.75v-1.5c0-.621.504-1.125 1.125-1.125m18.375 2.625V5.625m0 12.75c0 .621-.504 1.125-1.125 1.125m1.125-1.125v-1.5c0-.621-.504-1.125-1.125-1.125m0 3.75h-1.5A1.125 1.125 0 0118 18.375M20.625 4.5H3.375m17.25 0c.621 0 1.125.504 1.125 1.125M20.625 4.5h-1.5C18.504 4.5 18 5.004 18 5.625m3.75 0v1.5c0 .621-.504 1.125-1.125 1.125M3.375 4.5c-.621 0-1.125.504-1.125 1.125M3.375 4.5h1.5C5.496 4.5 6 5.004 6 5.625m-3.75 0v1.5c0 .621.504 1.125 1.125 1.125m0 0h1.5m-1.5 0c-.621 0-1.125.504-1.125 1.125v1.5c0 .621.504 1.125 1.125 1.125m1.5-3.75C5.496 8.25 6 7.746 6 7.125v-1.5M4.875 8.25C5.496 8.25 6 8.754 6 9.375v1.5m0-5.25v5.25m0-5.25C6 5.004 6.504 4.5 7.125 4.5h9.75c.621 0 1.125.504 1.125 1.125m1.125 2.625h1.5m-1.5 0A1.125 1.125 0 0118 7.125v-1.5m1.125 2.625c-.621 0-1.125.504-1.125 1.125v1.5m2.625-2.625c.621 0 1.125.504 1.125 1.125v1.5c0 .621-.504 1.125-1.125 1.125M18 5.625v5.25M7.125 12h9.75m-9.75 0A1.125 1.125 0 016 10.875M7.125 12C6.504 12 6 12.504 6 13.125m0-2.25C6 11.496 5.496 12 4.875 12M18 10.875c0 .621-.504 1.125-1.125 1.125M18 10.875c0 .621.504 1.125 1.125 1.125m-2.25 0c.621 0 1.125.504 1.125 1.125m-12 5.25v-5.25m0 5.25c0 .621.504 1.125 1.125 1.125h9.75c.621 0 1.125-.504 1.125-1.125m-12 0v-1.5c0-.621-.504-1.125-1.125-1.125M18 18.375v-5.25m0 5.25v-1.5c0-.621.504-1.125 1.125-1.125M18 13.125v1.5c0 .621.504 1.125 1.125 1.125M18 13.125c0-.621.504-1.125 1.125-1.125M6 13.125v1.5c0 .621-.504 1.125-1.125 1.125M6 13.125C6 12.504 5.496 12 4.875 12m-1.5 0h1.5m-1.5 0c-.621 0-1.125.504-1.125 1.125v1.5c0 .621.504 1.125 1.125 1.125M19.125 12h1.5m0 0c.621 0 1.125.504 1.125 1.125v1.5c0 .621-.504 1.125-1.125 1.125m-17.25 0h1.5m14.25 0h1.5" />
          </svg>
        </button>
        <button className="replay" onClick={replay} title="Replay Animation">
          <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" strokeWidth={1.5} stroke="currentColor" className="w-6 h-6">
            <path strokeLinecap="round" strokeLinejoin="round" d="M16.023 9.348h4.992v-.001M2.985 19.644v-4.992m0 0h4.992m-4.993 0l3.181 3.183a8.25 8.25 0 0013.803-3.7M4.031 9.865a8.25 8.25 0 0113.803-3.7l3.181 3.182m0-4.991v4.99" />
          </svg>
        </button>
        <div className="container">
          <div className="front" key={replayKey}>
            <div
              key={Date.now()}
              className={`box ${animation}`}
              style={{ '--ease': `var(--${ease})`, '--speed': speed }}
            >
              ease
            </div>
          </div>
          <div className="code-panel">
            <pre>
              <code
                className="language-css"
                dangerouslySetInnerHTML={{ __html: cssRef.current }}
              />
            </pre>
          </div>
        </div>
      </div>
      <div className="controls">
        <label for="ease">Ease</label>
        <select value={ease} id="ease" onChange={changeEase}>
          {keys.map((key) => {
            if (key === 'none') {
              return <option value="none">None</option>
            } else {
              const label = `${key.charAt(0).toUpperCase()}${key.slice(1)}`
              return (
                <optgroup label={label}>
                  <option value={`${key}-in`}>{`${label} In`}</option>
                  <option value={`${key}-out`}>{`${label} Out`}</option>
                  <option value={`${key}-in-out`}>{`${label} In Out`}</option>
                </optgroup>
              )
            }
          })}
        </select>
        <label for="animation">Animation</label>
        <select id="animation" value={animation} onChange={changeAnimation}>
          <option value="ltr">Left to Right</option>
          <option value="rtl">Right to Left</option>
          <option value="ttb">Top to Bottom</option>
          <option value="btt">Bottom to Top</option>
          <option value="si">Scale In</option>
          <option value="so">Scale Out</option>
          <option value="sd">Scale Down</option>
          <option value="su">Scale Up</option>
        </select>
        <label for="speed">Speed</label>
        <input
          onChange={changeSpeed}
          type="range"
          min="1"
          max="10"
          step="0.1"
          value={speed}
        />
      </div>
    </main>
  )
}

render(<App />, document.querySelector('#app'))

999px

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