JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1">
<input type="text" name="txt1" />
<input type="radio" name="radio1" value="m" />
<input type="radio" name="radio1" value="f" />
<input type="checkbox" name="checkbox1" value="opt1" />
<input type="checkbox" name="checkbox1" value="opt2" />
</div>
<button type="button" id="btn1">Click</button>

JavaScript

(function($) {
  var oldHTML = $.fn.html;

  $.fn.formhtml = function() {
    if (arguments.length) return oldHTML.apply(this,arguments);
    $("input,textarea,button", this).each(function() {
      this.setAttribute('value',this.value);
    });
    $(":radio,:checkbox", this).each(function() {
      // im not really even sure you need to do this for "checked"
      // but what the heck, better safe than sorry
      if (this.checked) this.setAttribute('checked', 'checked');
      else this.removeAttribute('checked');
    });
    $("option", this).each(function() {
      // also not sure, but, better safe...
      if (this.selected) this.setAttribute('selected', 'selected');
      else this.removeAttribute('selected');
    });
    return oldHTML.apply(this);
  };

  //optional to override real .html() if you want
  // $.fn.html = $.fn.formhtml;
})(jQuery);


$('#btn1').click(
    function(){
    alert($('#div1').clone().formhtml());
    }
);