Prototype lightbox won't work on page

Q: Dear Support

I've now inserted the coding onto a blank page....

It still doesn't work correctly... why??

A: Please, try to add the doctype declaration for universal compatibility:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

Notice, it should be the first line above all the code on your page.

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