What does the javascript (insert name of object here) 'defaultChecked' do?

What does the javascript (insert name of开发者_StackOverflow中文版 object here) 'defaultChecked' do?

The defaultChecked property returns the default value of the checked attribute.

This property returns true if the checkbox is checked by default, otherwise it returns false.

Quoted from W3Schools.

What don't you understand? http://www.w3schools.com/jsref/prop_checkbox_defaultchecked.asp

Maybe example will help? http://jsfiddle.net/yahavbr/cCpUu/

As you see if the checkbox has the "checked" attribute it will return true otherwise false - note however it's not affected by the "current" checked state of the checkbox.