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<html><body><h1>HTML DOM Events</h1><h2>The onclick Event</h2><p>Field1: <input type="text" id="field1" value="Hello World!"></p><p>Field2: <input type="text" id="field2"></p><p>Clicking "Copy" triggers a function that copies the text value from Field1 to Field2.</p><button onclick="myFunction()">Copy</button><script>function myFunction() { document.getElementById("field2").value = document.getElementById("field1").value;}</script></body></html>