We recommend upgrading to the latest Safari, Google Chrome, or Firefox. (more…)

This task tracks issues with Xcode 11 and iOS 13. Both are currently in Beta, with an expected release date sometime in September 2019. Related Issues Supporting Project Catalyst: Running iPad apps... (more…)

Imagine there’s a parallel universe that’s identical to ours in every way apart from one thing. Route parameters haven’t been invented yet… (more…)

I've been working with long-term Single Page Applications (SPA) since 2009. When you know an application has to be maintained for many years you have to approach technology adoption very carefully. React.js introduced a very interesting approach based on ... (more…)

We're the engineers behind Khan Academy. We're building a free, world-class education for anyone, anywhere. (more…)