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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/position-try-switch-from-fixed-anchor-ref.html 

<!doctype html>
<style>
body {
  width: 150vw;
  height: 150vh;
}
.anchor {
  width: 50px;
  height: 50px;
  background: orange;
}
#anchor1 {
  position: absolute;
  top: 100px;
  left: 350px;
}
#anchor2 {
  position:fixed;
  right: 0;
  bottom: 0;
}
#anchored {
  position: absolute;
  top: 50px;
  left: 350px;
  width: 50px;
  height: 50px;
  background: blue;
}
</style>
<div class="anchor" id="anchor1"></div>
<div class="anchor" id="anchor2"></div>
<div id="anchored"></div>