Today I Learned is an open-source project by Hashrocket that exists to catalogue the sharing & accumulation of knowledge as it happens day-to-day. Posts have a 200-word limit, and posting is open to any Rocketeer as well as selected friends of Hashrocket. We hope you enjoy learning along with us.
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Chrome devs can explain better than I can in the devtools release notes

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Today I Learned

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Find unused CSS and JS in Chrome 59