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<!DOCTYPE html>
<meta charset="utf-8">
<title>compute the kind of widget: author origin and animation origin</title>
<link rel="match" href="appearance-transition-001-ref.html">
<style>
input {
background-color: rgb(0, 0, 0);
}
.bg200 {
animation: 1e10s steps(2, start) animate-bg;
}
@keyframes animate-bg {
to {
background-color: rgb(0, 200, 0);
}
}
</style>
<input value="text" id=input>
<script>
document.documentElement.offsetTop;
input.classList.toggle('bg200');
</script>
<p>PASS if the input field has a dark green background</p>
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