As of jQuery 3, removeAttr does not set the corresponding property to false anymore:

here is common mistake to use .removeAttr( “checked” ) on a DOM element.

.prop( “checked”, false ) is the right way to checkbox checked.

Syntex Defination:

Use This
$(‘.checkeddata’).prop(‘checked’,true);
$(‘.checkeddata’).prop(‘checked’,false);

Not Use
$(‘.checkeddata’).attr(‘checked’,true);
$(‘.checkeddata’).attr(‘checked’,false);