If you aren't sure, try it out! 1.) go to your site 2.) open Chrome devtools 3.) in the Sources panel, find the biggest bundle file 4.) click the little "{}" button at the lower left to pretty-print 5.) start scrolling! How many of those lines look familiar?
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All of them, except the bad ones. I don't what the bundler did to those. Damn bundlers.

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What are some good resources for true mastery?
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I recommend marinating in chrome devtools performance tab. Does the relationship of network requests to when visible or main-thread work happening make sense? Then look at things w/ heavy CPU & network throttling. Is it what you expected?
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& Web Standards TL; Blink API OWNER
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