Knowing when resources are loaded is a key part of building functional, elegant websites. We’re used to using the DOMContentLoaded event (commonly referred to as “domready”) but did you know there’s an event that tells you when all fonts have loaded? Let’s learn how to use document.fonts!
The document.fonts object features a ready property which is a Promise representing if fonts have been loaded:
// Await all fonts being loaded
await document.fonts.ready;
// Now do something! Maybe add a class to the body
document.body.classList.add('fonts-loaded');
Font files can be relatively large so you can never assume they’ve loaded quickly. One simply await from document.fonts.ready gives you the answer!
JavaScript Promise API
While synchronous code is easier to follow and debug, async is generally better for performance and flexibility. Why “hold up the show” when you can trigger numerous requests at once and then handle them when each is ready? Promises are becoming a big part of the JavaScript world…
Spatial Navigation
Spatial navigation is the ability to navigate to focusable elements based on their position in a given space. Spatial navigation is a must when your site or app must respond to arrow keys, a perfect example being a television with directional pad remote. Firefox OS TV apps are simply…
Fullscreen API
As we move toward more true web applications, our JavaScript APIs are doing their best to keep up. One very simple but useful new JavaScript API is the Fullscreen API. The Fullscreen API provides a programmatic way to request fullscreen display from the user, and exit…
Source: davidwalsh.name
