position-fixed-at-bottom-right-on-viewport.html

<!doctype html>
<meta charset=utf-8>
<meta name="viewport" content="width=device-width">
<link rel="help" href="https://drafts.csswg.org/css-position/#fixed-pos">
<meta name="assert" content="This test checks that `bottom` and `right` returned by getComputedStyle for position:fixed elements attached to right bottom of the layout viewport expaned to the minimum-scale size">
<title></title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<style>
html, body {
  margin: 0;
  width: 100%;
  height: 100%;
}
#target {
  position: fixed;
  bottom: 0;
  right: 0;
  background: green;
  width: 100px;
  height: 100px;
}
</style>
<div style="width: 200%; height: 200%;"></div>
<div id="target"></div>
<script>
test(() => {
  assert_equals(getComputedStyle(target).bottom, "0px");
  assert_equals(getComputedStyle(target).right, "0px");
}, "position:fixed ");
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-position/position-fixed-at-bottom-right-on-viewport.html