file_window_print_delayed_during_load.html

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<!doctype html>

<meta charset="utf-8">

<body>

<script>

  onload = function() {

    let div = document.createElement("div");

    div.id = "added-during-load";

    div.innerHTML = "I should be printed";

    document.body.appendChild(div);

};

  window.print(); // This should be delayed until after load.

  window.close(); // So should this.

</script>