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javaScript Character Counting

HTML CODES:

<textarea rows="10" id="text"></textarea>


CSS CODE;

    
        var text = document.getElementById("text");
        var remaining = document.getElementById("remaining");

        text.oninput = function () {
            var max = 30;
            this.value = this.value.substr(0, max);
            var rem = max - this.value.length;
            remaining.innerHTML = "remaining character: " + rem;
        }
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