Form Confirmation
This script makes the reader confirm before submitting a form.

Discussion

 A form's onSubmit event handler must return true for the form to submit. In this example, a confirm dialog returns true or false and submission occurs only on confirmation. (You can tell when the page submits because it will reload.) 
<FORM onSubmit='return(confirm("Really Submit?"))'>
    <INPUT TYPE='SUBMIT'>
</FORM>
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