Daniel O’Connor

Notes from "CSS Frameworks and The Evolution of Airbnb's Frontend"

I went to a great event at Airbnb last week about O2 (their CSS framework) and the evolution of their front-end.

My key takeaways were:

  • We, at Optimizely, seem to be implementing similar JavaScript architecture that Airbnb implemented a few months ago and are enjoying. Probably a good sign!
  • O2, their front-end CSS framework, is providing a lot of the benefits that we are seeing at Optimizely with LEGO.
  • Their infrastructure to test the O2 re-skin internally seemed really neat.
  • Visual CSS testing seems like a nice idea, but too difficult at the moment to be worth the time.

Below are some notes from each of the three talks.

“State of the Airbnb front-end” by Spike Brehm of Airbnb

  • Introduced SASS and O2, a front-end CSS framework that was initially a fork of Bootstrap.
  • Their first JS frameworks were Backbone and Handlebars. This is bad because there was no data-binding.
  • Introduced React a few months ago with lots of success.
  • They are using flux a bit and liking it so far.
  • They ran into a bunch of problems with their Rails assets development so they now use CommonJS and NPM.
  • They now use Browserify, but webpack works fine too.
  • Isomorphic JS is JS that can be shared between different environments.
  • They wanted to run JS on their server for the mobile site so they used Backbone and NodeJS instead of Rails. Server-side JS rendering was much quicker and better for SEO.
  • Perceived performance is way quicker for server-side JavaScript. The page renders and you instantly have the content. Twitter saw a 5x perceived speed increase when they did this, too.
  • Joel Spolsky said the worst mistake a company can make is to rewrite from scratch.

“Inside the Airbnb Brand Evolution” by Fiona Tay of Airbnb

  • Rebranding was not as easy as changing the logo and a few hex codes.
  • Dealing with lots of legacy code.
  • Quick growth makes it hard to write good code.
  • They tested the redesign internally first by having an opt-in button on the website that was only visible to Airbnb admins. They got tons of internal feedback.
  • Rolled out O2 to all of the pages before launching the rebrand.
  • When they re-skinned O2, they got an instant rebrand.
  • O2 killed tons of old CSS.
  • They store O2 in a separate repository and import it with NPM. Custom SCSS that O2 doesn’t provide is written in the Airbnb repository, not the O2 repository.

“Implementing a Visual CSS Testing Framework” of @jessicard of Bugsnag

  • They wanted to visually test CSS by creating diffs and couldn’t find a good tool, so they created one.
  • Added save screenshot function calls in their rspec tests.
  • Use BuildKite for their CI.
  • Use selenium with Browserstack for the screenshots.
  • Use imagemagick to make the diffs.
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