I recommend Quick Source Viewer , which is an extension for chrome and does not require copying as human copies (acts as an additional chrome-dev tool). It can show you the source of the current page, formatted and color-coded.
This is quite powerful, showing all the "sources" of the page, whether it be css, js or html. Even things like inline css / js can be viewed individually (with highlighted highlighted code). And the best part is all their stumbling blocks, even css (which chrome dev tools still refuses to do).
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