<h1 id="target" onclick="func1()">
This little piggy went to market and this little piggy stayed home.
</h1>
<script>
function func1(){
var targetElem = document.getElementById("target");
window.t = targetElem;
targetElem.select();
document.execCommand("copy");
alert("Copied the text: " + targetElem.value);
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</script>