<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<textarea id="textId">Some copying text</textarea>
<button id="copyBtn">Copy Button</button>
<script>
document.getElementById("copyBtn").onclick = function() {
let text = document.getElementById("textId").value;
copyTextToClipboard(text);
}
async function copyTextToClipboard(text) {
try {
await navigator.clipboard.writeText(text);
alert('Text copied to clipboard');
} catch(err) {
alert('Error in copying text: ', err);
}
}
</script>
</body>
</html>