JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" value="default" />

JavaScript

$.fn.defaultValue = function(){ 
         
         return this.each(function(){ 
            var default_value = $(this).val(); 
            var $this = $(this);
    
            $this.focus( function() {

                if ($this.val() == default_value) $(this).val("");
                });
            $this.blur( function() {
                if ($this.val().length == 0){
                    $this.val(default_value); 
                }
            })            
         }); 
         }; 
                          
                         
$('input').defaultValue();