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Everyone has JavaScript, right?
Tag Archives: progressive enhancement
Move Fast & Don’t Break Things
Embedded above, but also available as a transcript, is Scott Jehl’s talk “Move Fast & Don’t Break Things” on how to keep your website performant. The talk starts of with Progressive Enhancement (of course!) and covers things such as Responsive Images, Native Lazy Loading of Images, font-display: swap;, Paint Metrics, etc. Move Fast & Don’t …
Unpoly – The unobtrusive JavaScript framework for server-side web applications
Unpoly is an unobtrusive Javascript framework for applications that render on the server. It allows your views to do things that are not normally possible in HTML, such as having links update only fragments of a page, or opening links in modal dialogs. Unpoly can give your server-side application fast and flexible frontends that feel …
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Using @supports to detect if a browser supports CSS Variables
UPDATE: The code snippet has been updated to use –custom instead of –. When Ire originally tweeted this — was a valid name for a custom property. This is no longer the case. As tweeted by Ire Aderinokun: @supports (color: var(–custom)) { /* has support */ } Not too surprising if you’ve used Feature Queries …
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Network based image loading using the Network Information API in Service Worker
Clever use of a service worker in combination with navigator.connection.effetiveType by Michael Scharnagl. The SW watches all requests for image resources, and rewrites them to high resolution versions in case navigator.connection.effetiveType is fast enough. Network based image loading using the Network Information API in Service Worker →
SQIP – SVG-Based Image Placeholder
In an in-depth analysis on how Medium loads up their images, José M. Pérez explains how their “blur-up technique” works: Display a resized version of the original at the original size, with a blur filter on top to hide the artifacts. Load in the bigger one. Once the big version is loaded, replace the small …
Check if a browser supports ES6 ES2015
Great snippet by Benjamin De Cock: var supportsES6 = function() { try { new Function(“(a = 0) => a”); return true; } catch (err) { return false; } }(); The critical test is the a = 0. All browsers supporting default parameters have a fairly complete support of ES6 — for example, Edge 13 will …
Adding “feature X is unsupported” warnings in your CSS Demos with @supports
Great tip from tuts+: When your CodePen demos rely on cutting edge CSS it’s a good idea to warn people. Let’s provide a notification when browsers don’t support our demos, using the @supports rule to make a handy reusable CodePen asset. New to Feature Queries (e.g. @supports)? Using Feature Queries in CSS will get you …
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Feature Detection in CSS (CSS @supports)
There’s a good introduction to @supports on Mozilla Hacks: With @supports, you can write a small test in your CSS to see whether or not a particular “feature” (CSS property or value) is supported, and apply a block of code (or not) based on the answer. Progressive enhancement in it’s finest form: /* fallback code …
Enhancing Optimistically
Here’s how Filament Group enhances (or: used to) their website for browsers that “Cut the Mustard”: if( "querySelector" in window.document && "addEventListener" in window ){ // This is a capable browser, let's improve the UI further! window.document.documentElement.className += " enhanced"; // load the enhanced scripting loadJS( "/path/to/enhancements.js" ); } But what if a browser is …