With all due respect, the question isn't about various HTML development practices. The question is, could someone who has used perl to automate graphical web browsers (or their underlying rendering engines) recommend a library to work with the rendered image sizes in a given browser context.
I'm guessing that if you have never used (for example, from doing a search on various rendering engines in CPAN) Mozilla::Mechanize, or WWW::Mechanize, or WWW::WebKit, or something else like it I'm unaware of, you'll be of limited help in making a recommendation.
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