gfx/layers/apz/test/mochitest/helper_hittest_iframe_perspective_child.html


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<!DOCTYPE html>
<script>
  window.addEventListener("mousedown", event => {
    let data = JSON.stringify({
      type: "got-mouse-down",
      coords: {
        offsetX: event.clientX,
        offsetY: event.clientY
      }
    });
    window.parent.postMessage(data, "*");
  });
</script>