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Test Info:

<!DOCTYPE HTML>
<html>
<link rel="help" href="https://drafts.csswg.org/css-animations/">
<link rel="match" href="pseudo-animations-print-ref.html">
<title>Static CSS animation</title>
<style>
@keyframes a {
from, to { color: blue }
}
p {
color: olive;
animation: a 1s infinite;
}
p::after {
color: purple;
content: "(::after)";
animation: a 1s infinite;
}
p::before {
color: yellow;
content: "(::before)";
animation: a 1s infinite;
}
</style>
<p>blue with animation support; olive without</p>