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Some of the ideas currently in discussion at the W3C regarding the Selectors Level 4 Draft.
Arturo Campos
A significant change for one of the most used developer sites in the world. This post digs into the changes made and how they performed during A/B testing.
Stack Overflow
What is the performance reality of embedding external assets directly into pages or stylesheets? The conclusion is ‘Base64 still feels like a huge anti-pattern.’
Harry Roberts
Get real-time crash alerts and collect detailed diagnostics so you can fix errors for your users. See deminified stacktraces with support for sourcemaps. Cut through front-end noise so you can efficiently assess the impact of errors. Learn more. Bugsnag Sponsor
A simple, practical example of how CSS variables (supported in all major browsers except Edge) can lead to looser coupling and better code when JS needs to interact with CSS.
Sérgio Gomes
By default, Google Analytics tracks pageviews, but there are many other common on-page events that can be tracked (form submits, scrolling, page visibility). Autotrack makes this easier to do.
Google
Essentially a list of 113 HTML elements which link to pages explaining their use and the attributes they support, if any. There’s a similar reference for CSS too. Jeremy Thomas
Covers basic HTML, CSS, the box model, flexbox, floats, etc. Suited for beginners but I found the flexbox page a good primer on its own. Interneting Is Hard
The Web Speech API provides the ability to voice-enable your website by using the SpeechRecognition and the SpeechSynthesis interfaces.
Aaron Gustafson
Jobs 
Can't find the right job? Want companies to apply to you? Try Hired.com.
In Brief
Editor's Draft of CSS Timing Functions Level 1 news
W3C
Achieving 60 FPS Mobile Animations with CSS3 tutorial
Jose Roasario shares tips for animating elements in mobile contexts.
Sitepoint
A Basic Introduction to CSS Attribute Selectors tutorial
e.g. href$="5555" for links to URLs ending in ‘5555’.
Tiffany Brown
Create data-intensive, feature-rich web and mobile apps with Sencha Ext JS tutorial
Learn how to design, develop and test data-intensive web apps that run on desktops, tablets, and smartphones with Sencha Ext JS
Sencha, Inc. Sponsor
The Google Analytics Setup I Use on Every Site I Build tutorial
Philip Walton
Exercises in Flexbox: Simple Web Components tutorial
Zviad Sichinava
More HTML5 Semantics: New Elements and Features tutorial
Louis Lazaris
Creating a 'Rollover' Map of the US with SVG and JS tutorial
Chris Coyier
CSS Grid Layout Terminology, Explained tutorial
Ire Aderinokun
HTML Canvas Cheatsheet tutorial
Skilled
HTML5 for the Mobile Web: Browser Forms and Input Types story
An overview of new form controls, how they look, behave and are supported on various mobile browsers.
Ruadhán O'Donoghue
A Battle Rages for The Future of The Web opinion
The W3C, led by Sir Tim Berners-Lee, looks set to standardise DRM-enabling Encrypted Media Extensions (EME) in browsers.
Ars Technica UK
Front-end ♥ npm; npm ♥ you tools
Bring npm to work to unblock collaboration, quit reinventing the wheel, and build amazing things.
npm, Inc. Sponsor
CSSO: A CSS Minifier with Structural Optimizations tools
Sergey Kryzhanovsky
A Collection of 180 Curated CSS3 'Web Gradients' tools
itmeo
ScrollDir: Leverage Vertical Scroll Direction in CSS Via a Data Attribute code
Dollar Shave Club
SVGO: A Node-Based Tool for Optimizing SVG Files code
A long standing project but still getting frequent updates.
Rythm.js: Make Elements On Your Page 'Dance' code
A funny effect but warning: music autoplays.
Benjamin Plouzennec
Sticky-Kit: jQuery Plugin for Sticky Elements code
Attach elements to the page when the user scrolls.
Fluid Paint: A WebGL-based Painting Experience demo
A browser-based WebGL painting simulator. Code.
David Li
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