testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/top-layer-position-ref.html


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<!DOCTYPE html>

<style>
dialog {
  background-color: green;
  height: 50px;
  width: 50px;
  border: none;
  padding: 0;
  margin: 0;

  position: absolute;
  top: 100px;
  left: 100px;
}
</style>

<dialog></dialog>

<script>
document.querySelector('dialog').showModal();
</script>