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$('input[type="checkbox"]').on('change', function() {    $(this).siblings('input[type="checkbox"]').not(this).prop('checked', false); }); First method <html><head>   <script type="text/javascript" src="//code.jquery.com/jquery-2.1.0.js"></script> <script type="text/javascript">//<![CDATA[ $(window).load(function(){ $('input[type="checkbox"]').on('change', function() {    $(this).siblings('input[type="checkbox"]').not(this).prop('checked', false); }); });//]]> </script> </head> <body>   <div>     <span>Group 1:</span>     <input class="group1" checked="" type="checkbox">     <input class="group1" type="checkbox">     <input class="group1" type="checkbox"> </div> <div>     <sp...

        <form action = "third.php" method = "get" > Red <input type = "checkbox" name = "color[]" id = "color" value = "red" > Green <input type = "checkbox" name = "color[]" id = "color" value = "green" > Blue <input type = "checkbox" name = "color[]" id = "color" value = "blue" > Cyan <input type = "checkbox" name = "color[]" id = "color" value = "cyan" > Magenta <input type = "checkbox" name = "color[]" id = "color" value = "Magenta" > Yellow <input type = "checkbox" name = "color[]" id = "color" value = "yellow" > Black <input type = "checkbox" name = "color[]" id = "color" value = "black" > ...