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<html><style>#text {display:none;color:red}</style><body><h3>Detect Caps Lock</h3><p>Press the "Caps Lock" key inside the input field to trigger the function.</p><input id="myInput" value="Some text.."><p id="text">WARNING! Caps lock is ON.</p><script>var input = document.getElementById("myInput");var text = document.getElementById("text");input.addEventListener("keyup", function(event) {if (event.getModifierState("CapsLock")) { text.style.display = "block"; } else { text.style.display = "none" }});</script></body></html>