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<!DOCTYPE html>
<html>
<head>
<title>Character Limit Text Box</title>
<script>
function limitCharacters() {
var textbox = document.getElementById("message");
var charCount = document.getElementById("charCount");
charCount.textContent = textbox.value.length;
if (textbox.value.length > 3000) {
textbox.value = textbox.value.substr(0, 3000);
charCount.style.color = "red";
} else {
charCount.style.color = "black";
}
}
</script>
</head>
<body>
<textarea id="message" rows="10" cols="40" oninput="limitCharacters()"></textarea>
<p>Character Count: <span id="charCount">0</span> / 3000</p>
</body>
</html>