I wrote HTTP::Size to do just this. From the docs:
get_sizes( URL, BASE_URL )

The get_sizes function is like get_size, although for HTML pages it also fetches all of the images then sums the sizes of the original page and image sizes. It returns a total download size. In list context it returns the total download size and a hash reference whose keys are the URLs of the images found in the HTML and whose values are hash references with these keys:
--
brian d foy <bdfoy@cpan.org>

In reply to Re: determine web page size, w/ and w/o images by brian_d_foy
in thread determine web page size, w/ and w/o images by water

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