JSFiddle - React, Tailwind, and code Playground

HTML

<div id="testdiv_from">
<input type="text" id="text1" value="13"/>
</div>

<div id="testdiv_to">
</div>

<input type="button" onclick="save();"/>

<script>
function save() {
document.getElementById("testdiv_to").innerHTML = document.getElementById("testdiv_from").innerHTML;
}
</script>