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CSS Wizardry

Front-End’s Missing Metric: The TBT Window Meet Your Users Where They Are with Obs.js Better Browser Caching with No-Vary-Search font-family Doesn’t Fall Back the Way You Think What Is CSS Containment and How Can I Use It? When All You Can Do Is All or Nothing, Do Nothing Obs.js: Context-Aware Web Performance for Everyone Low- and Mid-Tier Mobile for the Real World (2025) The Fastest Site in the Tour de France Making Sense of the Performance Extensibility API Why Do We Have a Cache-Control Request Header? HTML Is Not a Programming Language… Build for the Web, Build on the Web, Build with the Web Licensing Code on CSS Wizardry A Layered Approach to Speculation Rules Designing (and Evolving) a New Web Performance Score Core Web Vitals Colours The Ultimate Contract Templates for Tech Consultants: Protect Your Business and Get Paid Optimising for High Latency Environments Cache Grab: How Much Are You Leaving on the Table? blocking=render: Why would you do that?! Correctly Configure (Pre) Connections The Three Cs: 🤝 Concatenate, 🗜️ Compress, 🗳️ Cache What Is the Maximum max-age? How to Clear Cache and Cookies on a Customer’s Device The Ultimate Low-Quality Image Placeholder Technique Core Web Vitals for Search Engine Optimisation: What Do We Need to Know? The HTTP/1-liness of HTTP/2 In Defence of DOM­Content­Loaded Site-Speed Topography Remapped Why Not document.write()? Speeding Up Async Snippets Critical CSS? Not So Fast! Measure What You Impact, Not What You Influence Optimising Largest Contentful Paint Measuring Web Performance in Mobile Safari Site-Speed Topography Speed Up Google Fonts Real-World Effectiveness of Brotli Performance Budgets, Pragmatically Lazy Pre-Browsing with Prefetch Making Cloud.typography Fast(er) Time to First Byte: What It Is and How to Improve It Self-Host Your Static Assets Tips for Technical Interviews Cache-Control for Civilians Bandwidth or Latency: When to Optimise for Which ITCSS × Skillshare What If? CSS and Network Performance The Three Types of Performance Testing Getting to Know a Legacy Codebase Image Inconsistencies: How and When Browsers Download Images Identifying, Auditing, and Discussing Third Parties My Digital Music Setup Measuring the Hard-to-Measure Finding Dead CSS The Fallacies of Distributed Computing (Applied to Front-End Performance) Ten Years Old Relative Requirements Airplanes and Ashtrays Performance and Resilience: Stress-Testing Third Parties Refactoring Tunnels Little Things I Like to Do with Git Writing Tidy Code Configuring Git and Vim Base64 Encoding & Performance, Part 2: Gathering Data Base64 Encoding & Performance, Part 1: What’s Up with Base64? Code Smells in CSS Revisited Typography for Developers Moving CSS Wizardry onto HTTPS and HTTP/2 Ack for CSS Developers A New Year, a New Focus Preparing Vim for Apple’s Touch Bar Choosing the Correct Average CSS Shorthand Syntax Considered an Anti-Pattern CSS Wizardry Newsletter Nesting Your BEM? Improving Perceived Performance with Multiple Background Images Continue Normalising Your CSS Pure CSS Content Filter Pragmatic, Practical, and Progressive Theming with Custom Properties Refactoring CSS: The Three I’s Speaker’s Checklist: Before and After Your Talk Improving Your CSS with Parker The Importance of !important: Forcing Immutability in CSS Mixins Better for Performance Managing Typography on Large Apps White October Events Workshop Partnership BEMIT: Taking the BEM Naming Convention a Step Further Travelling Like You Want to, When You Have To Contextual Styling: UI Components, Nesting, and Implementation Detail Subtleties with Self-Chained Classes Cyclomatic Complexity: Logic in CSS Immutable CSS Can CSS Be Too Modular? More Transparent UI Code with Namespaces When to use @extend; when to use a mixin The Specificity Graph CSS Wizardry Ltd.: Year 1 in review
Let’s work together
Harry Roberts · 2013-10-18 · via CSS Wizardry

Written by on CSS Wizardry.

Table of Contents

Independent writing is brought to you via my wonderful Supporters.

  1. Featured case study: NHS

Almost three months ago I handed in my notice at Sky, where I’d spent the last two-and-a-bit years as a Senior Developer. My time at Sky has been amazing; I learned so much about big sites, architecture, scalability, performance, big teams, maintenance, working on products and a lot, lot more. Sky has been great – and the most formative work of my career so far – so choosing to leave was an incredibly difficult decision; one which took a long time to make. You can read a lot more about that in my (now infamous) post, Make it count, from back in July. Now, for the next chapter…

I’m going it alone.

I’ve spent over five years working on CSS Wizardry; writing articles, sharing techniques and code and research and findings, creating and contributing to open source projects, speaking at conferences and a whole lot more. Now I want to make all this stuff work for me. I want to take all the things I do – and have done – and do them for you, whoever and wherever you may be.

I want to work with talented teams – working on amazing products – all across the globe. I want to work with nice people who care as much about building great things as I do, and having fun in the process. I want people who take their work, but not themselves, seriously. I want to work with you.

Featured case study: NHS

How I helped the NHS rapidly build a brand new product.

Read case study…

I am going to become available from the end of October/mid-November so – regardless of your location, budget, requirements or whatever – if you think we could work together then let me know. We’ll see what we can work out.

My ideal clients – the ones who would benefit from me the most – are startups and products who have tech teams I can collaborate with. I specialise in scaling front-ends on products with skilled engineers. If you’re a startup expecting to grow, I can help that happen. If you’re a developer working on a product that needs someone to build a robust and scalable front-end, I’m your guy. If you’re an agency who needs help training your team to be able to build bigger websites for bigger clients, get in touch.

That said, I have no lists of what I can and cannot do, nor do I have lists of what I will and will not do, I’m open to pretty much anything. If you think your team or product or app or service or agency or startup could benefit from anything I could offer then just drop me a line. One of the most important things that I want to gain from this (ad)venture is variety. From consulting to dev work, workshops to speaking, I want to work on an array of things for nice people. I don’t mind what your product or project is, or what your budget may be, let’s chat it over and see what we can do together.