iframe-background-attachment-fixed-inner.html

<!DOCTYPE html>
<style>
.background-attachment-fixed {
  background-image: url("white-1x1.png"), url("white-1x1.png");
  background-attachment: fixed, local;
}
</style>

<div id="content" style="will-change:transform; height: 2000px;" class="background-attachment-fixed" />

chromium/third_party/blink/renderer/core/testing/data/iframe-background-attachment-fixed-inner.html