toolkit/components/printing/tests/file_window_print_reentrant.html


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<!doctype html>
<div id="before-print-count"></div>
<script>
let count = 0;
onload = function() {
  window.addEventListener('beforeprint', () => {
    document.getElementById("before-print-count").innerText = ++count;
    print()
  });
  print()
};
</script>