File: cross-origin-tall-iframe-rendering-ref.html

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<!DOCTYPE html>
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Intersection observer with cross-origin iframe and tall viewport</title>
<style>
:root { scrollbar-width: none }
.spacer {
  height: calc(200vh + 100px);
}
.frame {
  width: 160px;
  height: 5100px;
  outline: 1px solid;

  > .spacer {
    height: 5000px;
  }

  > .target {
    height: 100px;
    background-color: green;
  }
}
</style>
<div class="spacer"></div>
<div class="frame"><div class="spacer"></div><div class="target"></div></div>
<div class="spacer"></div>
<script>
document.querySelector(".frame").scrollIntoView({ block: "end" });
</script>