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document.getElementById("passwordInput").onkeypress = function (t) {
    var e = t.keyCode || t.which, i = t.shiftKey || 16 == e || !1
    if (!!(e >= 65 && e <= 90 && !i || e >= 97 && e <= 122 && i)) {
        console.log("Caps lock is open...")
    }
}