i have a example code here (from w3schools):
<!DOCTYPE html>
<html>
<body>
<p>Click on the button to copy the text from the text field. Try to paste the text (e.g. ctrl+v) afterwards in a different window, to see the effect.</p>
<input type="text" value="Hello World" id="myInput">
<button onclick="myFunction()">Copy text</button>
<script>
function myFunction() {
/* Get the text field */
var copyText = document.getElementById("myInput");
/* Select the text field */
copyText.select();
copyText.setSelectionRange(0, 99999); /* For mobile devices */
/* Copy the text inside the text field */
navigator.clipboard.writeText(copyText.value);
/* Alert the copied text */
alert("Copied the text: " + copyText.value);
}
</script>
</body>
</html>