<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Animating font (and text) properties</title>
<style type="text/css">
html {background: silver;}
body {background: white; margin: 1em; padding: 1em;}
label {border: 1px solid rgba(0,0,0,0.5); border-radius: 2ch; padding: 0.5ch 1.5ch; font: bold 1em sans-serif;}
label:focus {background: yellow;}
#run:checked + label {color: white; background: darkgreen;}
.arena ol {margin-top: 1em; border-top: 1px solid gray;}
.arena ol li {animation: 2s 0s paused linear alternate infinite;}
#run:checked ~ ol li {animation-play-state: running;}
.arena li:nth-child(1) {animation-name: sizer;}
.arena li:nth-child(2) {animation-name: adjuster;}
.arena li:nth-child(3) {animation-name: weighter;}
.arena li:nth-child(4) {animation-name: styler;}
.arena li:nth-child(5) {animation-name: stretcher;}
.arena li:nth-child(6) {animation-name: heighter;}
@keyframes sizer {
from {font-size: 1em;}
to {font-size: 2em;}
}
@keyframes heighter {
from {line-height: 1em;}
to {line-height: 4em;}
}
@keyframes weighter {
from {font-weight: 400;}
to {font-weight: 900;}
}
@keyframes styler {
from {font-style: normal;}
to {font-style: italic;}
}
@keyframes styler {
from {font-stretch: ultra-condensed;}
to {font-stretch: ultra-expanded;}
}
@keyframes adjuster {
from {font-size-adjust: 0.5;}
to {font-size-adjust: 1;}
}
</style>
</head>
<body>
<form class="arena">
<input type="checkbox" id="run"> <label for="run">Run animations</label>
<ol>
<li><p>A paragraph.</p></li>
<li><p>A paragraph.</p></li>
<li><p>A paragraph.</p></li>
<li><p>A paragraph.</p></li>
<li><p>A paragraph.</p></li>
<li><p>A paragraph.</p></li>
</ol>
</form>
</body>
</html>