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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>