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DEVTOOLS & HEADLESS CHROME: THE AUTOMATION POWER-COUPLE

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@cowchimp Yonatan Mevorach

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Web Automation youtu.be/fsF7enQY8uI

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”I can’t automate this” -- no one ever (after watching this talk)

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flic.kr/p/qnSPdN cbnd Headless Browsers

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Chrome

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Chrome headless

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[ { "time": "08:00 - 09:00", "title": "Registration, Breakfast, and Booths Open" }, { "time": "09:00 - 09:30", "title": "Opening of the Conference" }, { "time": "09:30 - 10:00", "title": "DevTools and Headless Chrome – The Automation Power-Couple" }, { "time": "10:05 - 10:35", "title": "Web performance in large-scale applications" }, { "time": "10:40 - 11:10", "title": "Backends for frontends with GraphQL" }, { "time": "11:10 - 11:45", "title": "Break" }, { "time": "11:45 - 12:15", "title": "JavaScript security: a retrospective" }, { "time": "12:20 - 12:50", "title": "Moving Web applications into Virtual Reality" }, { "time": "12:55 - 13:50", "title": "Lunch" }, { "time": "13:55 - 14:20", "title": "OpenSpace opening" }, { "time": "14:25 - 14:55", "title": "Channel your inner rockstar with the web audio API." }, { "time": "15:00 - 15:25", "title": "Break" }, { "time": "15:30 - 16:00", "title": "Challenge Accepted: Scoping Errors in “Multi-App” Environment" }, { "time": "16:05 - 16:40", "title": "Getting rid of runtime errors with Elm" }, { "time": "16:40 - 17:00", "title": "Close Day" }, { "time": "19:00 - ...", "title": "Dinner and Party" } ]

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Chrome headless

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Firefox headless

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Chrome DevTools

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Chrome DevTools protocol

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Headless API Embedding app Chrome DevTools Frontend Adapted from content by © Sami Kyöstilä, Google goo.gl/yQi9kZ WebSockets

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Headless API Embedding app Chrome DevTools Frontend { id: 1, method: "Runtime.evaluate", params: { expression: "1 + 1" } } Adapted from content by © Sami Kyöstilä, Google goo.gl/yQi9kZ

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Headless API Embedding app Chrome DevTools Frontend { id: 1, result: { result: { type: "number", value: 2, description: "2" }, wasThrown: false } } { id: 1, method: "Runtime.evaluate", params: { expression: "1 + 1" } } Adapted from content by © Sami Kyöstilä, Google goo.gl/yQi9kZ

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Headless API Embedding app DevTools target DevTools client Adapted from content by © Sami Kyöstilä, Google goo.gl/yQi9kZ

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node --inspect index.js

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headless protocol

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chrome --headless --remote-debugging-port=9222 https://frontcon.lv

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chrome --headless --remote-debugging-port=9222 https://frontcon.lv

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chrome --headless --remote-debugging-port=9222 https://frontcon.lv

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chrome --headless --remote-debugging-port=9222 https://frontcon.lv

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chrome --headless --remote-debugging-port=9222 https://frontcon.lv

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goo.gl/j41BaC Recap!

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blog.cowchimp.com @cowchimp tinyurl.com/ headless-talk