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Wait, what's the difference between this and using a Ruby/Python/etc REPL? In other words, normally to achieve this same result I would do:

irb -> require 'Nokogiri' and require 'open-uri' -> doc = Nokogiri::HTML(open('http://www.google.com/'))

and no need to store the HTML via wget on my machine. Am I missing something?

The difference is that you don't have to know python/ruby, remember specific package names and to install them before using.

You can use this with pipes and redirectors in the command line.

Example: nokogiri https://news.ycombinator.com -e 'puts $_.css("td.title a @href")'