JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<body>
    <script>
    function testFunc(){
            alert("onmouseup called");
    }
    </script>
    <input type="button" value="Test" id="x" onmouseup="testFunc()"/>
    <script>
        document.getElementById("x").onmouseup();
    </script>
</body>
</html>