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chromium/third_party/blink/web_tests/paint/background/zoomed-inset-shadow.html 

<!DOCTYPE html>
<title>For crbug.com/1347097</title>
<!-- This is not a WPT test because 'zoom' is not a standard CSS property. -->
<style>
.test {
  width: 14px;
  height: 14px;
  background: red;
  box-shadow: inset 16px 0 green;
}
</style>
<div class="test"></div>
<div class="test" style="zoom: 1.1"></div>
<div class="test" style="zoom: 1.218"></div>
<div class="test" style="zoom: 1.337"></div>
<div class="test" style="zoom: 3.122"></div>