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?

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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.

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

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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.