JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <input type="text" value="Default">
    <input type="submit">
</form>

JavaScript

$(":submit").on("click", function() {
    $("form :text").attr("value", function() {
        return this.value;
    });
    
    var html = $("body").html();
    alert(html);
    
    return false;
});