copy to clipboard

<script>
function copyToClipboard(elementId) {

 // Create a "hidden" input
 var aux = document.createElement("input");

 // Assign it the value of the specified element
 aux.setAttribute("value", document.getElementById(elementId).innerHTML);

 // Append it to the body
 document.body.appendChild(aux);

 // Highlight its content
 aux.select();

 // Copy the highlighted text
 document.execCommand("copy");

 // Remove it from the body
 document.body.removeChild(aux);

}
</script>
<button onclick="copyToClipboard('copy-to-clipboard')">copy to clipboard</button>