In this episode of Syntax, Scott and Wes talk about dev tools tabs, what each tab does and how you can use them.

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Show Notes 3:50 - Network

• See all requests, filter by type or name
• Used to understand all requests coming or going
• Turn off caching
• View timing
• See the true GZIP size
• Slow down network speed
• See time for page load
• Copy as fetch or CURL
• View request, response, and headers
• See CORS issues
• See which requests have happened
• See if an asset is cached (both in dev tools, also Cloudflare)
• See blocked requests because of extensions
• Tip: You can see the network info from the console in Firefox

22:03 - Memory

• See what is taking up memory
  • Strings
  • DOM nodes
  • Objects
  • Actual .js

26:44 - Performance

• Click record and use the site
• Flame chart useful for finding slow functions and debugging janky animations
• Get FPS in coordination with flame chart
• Save performance recording data to be able to share for debugging
• You can also upload saved data to debug without using the site

30:48 - Console

• Interfaces with the JS runtime
• Shows errors, warnings, and logs
• Tip: Negate noisy warnings/errors that clutter your console with -
• Tip: Use $0 to select current element
  • $1 for second last
  • $r for current React element
• Tip: Use $$ to shortcut Query SelectorAll and Array.from
• Tip: Use $ to shortcut Query Selector

40:28 - Storage / Application

• Working with LocalStorage, Cookies, Index DB, and Session Storage

44:56 - Audit / Lighthouse (Chrome and Firefox)

• Run lighthouse to check for performance, accessibility, and UI stuff
• Not the silver bullet audit that many people think it is
  • Colors are sometimes like “Really?!”
• Can be helpful regardless

50:28 - DOM Tab

• Firefox only
• Shows everything that is in the scope of the browser

Links * Adam Wathan * Ben Vinegar

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