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<!DOCTYPE html>
<html>
<body>
<h3>Trigger Button Click on Enter</h3>
<p>Press the "Enter" key inside the input field to trigger the button.</p>
<input id="myInput" value="Some text..">
<button id="myBtn" onclick="javascript:alert('Hello World!')">Button</button>
<script>
var input = document.getElementById("myInput");
input.addEventListener("keypress", function(event) {
  if (event.key === "Enter") {
    event.preventDefault();
    document.getElementById("myBtn").click();
  }
});
</script>
</body>
</html>