backdrop-filter-clip-radius-zoom.html

<!DOCTYPE html>
<title>Backdrop filter clipping radius with zoom</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">

<!--You should see two completely filled black rectangles with rounded corners.-->

<!-- TODO(978481): Convert this back to WPT test. See crbug.com/978481 for
  an implementation in WPT that is waiting for the WPT Fuzzy Matching feature.
-->

<div id='rect1'></div>
<div id='rect2'></div>

<style>
body {
  zoom: 5;
}
div {
  width: 100px;
  height: 20px;
  backdrop-filter: invert(1);
  border: 2px dashed green;
}
#rect1 {
  border-radius: 20px / 5px;
}
#rect2 {
  position: relative;
  top:5px;
  border-radius: 4px;
}
p {
    font-size: 0.2em;
}
</style>

chromium/third_party/blink/web_tests/css3/filters/backdrop-filter-clip-radius-zoom.html