Please add the possibility to create the page height below 73px.
Especially for the design of web banners sometimes a smaller page height is important.
Despite frame distances of 0px and web setting an error message appears with a page height of 72px or lower.
Richard Racette commented
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This is probably just due to your margin settings...set those all to zero in the new document window. I just created a new 1px by 1px document as a test and it worked fine.