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<html><body><h1>Is the Shift Key Pressed?</h1><p>Click in the input field, then hold down the Shift key and click in the input field again:</p><input type="text" size="40" onmousedown="myFunction(event)"><p id="demo"></p><script>function myFunction(event) { let x = event.getModifierState("Shift"); document.getElementById("demo").innerHTML = "Pressing the shift key: " + x;}</script></body></html>