Headless mode is a useful way to run Firefox, which is just as it sounds — Firefox is run as normal, except without any of the UI components visible. This may not be very useful for surfing the web, but it is very useful for automated testing.
The seeming complexity of requestAnimationFrame unfortunately scares many designers away: as a low-level API, it doesn’t provide much by default, resulting in boilerplate code that might initially seem disproportionate for the most basic effects. But once you grasp the few fundamental concepts, you enter a whole new world of possibilities. Let’s demystify this fantastic animation tool!
“CSS Modules” is nothing to do with the W3C, rather part of a suggested build process. It compiles your project, renaming the selectors and classes so that they become unique, scoped to individual components
As progressive web apps become more popular, navigation has become fraught with peril. It's common for apps to make tens of requests to render a single page. Asynchronously loaded page elements shift click targets, resulting in a usability nightmare.