Performance & Accessibility
Redirect Chains and Performance, Done Properly
Sequences of redirects, such as http to https to www to a trailing slash, that a browser must follow before it reaches the final page. Key takeaways Cost: each...
Lumexa Media · Writing
The journal
Working notes from a studio that edits images, cuts video, mixes audio, builds websites, renders 3D and argues about search results. Every article is written by a named person and cites the body that published the figures in it.
5,872 articles across 14 disciplines
Performance & Accessibility
A Practical Guide to Excessive DOM Size
Pages with very large numbers of HTML elements, often from complex layouts, long lists, mega menus or page builders, which make rendering and scripting slower....
Performance & Accessibility
How to Get Unused CSS and JavaScript Right
Code downloaded by a page that is never used there, commonly from frameworks, component libraries or site-wide bundles. Key takeaways Coverage tab: Chrome DevTo...
Performance & Accessibility
A Practical Guide to Fetch Priority
The fetchpriority attribute, which tells browsers which resources matter most and which can wait. Key takeaways Attribute: fetchpriority accepts high, low and a...
Performance & Accessibility
Video Loading Performance: The Decisions That Matter
How embedded video affects page load, and the attributes and formats that keep it light. Key takeaways preload: the attribute controls how much video loads befo...
Performance & Accessibility
Hydration Cost and Islands, Done Properly
The work browsers do to make server-rendered HTML interactive, and architectures that reduce it. Key takeaways Hydration: client JavaScript attaches behavior to...
Performance & Accessibility
A Practical Guide to Memory Leaks in Long-Lived Pages
Memory that a page keeps allocating and never releases, a problem for dashboards and apps left open for hours. Key takeaways Detached nodes: removed DOM element...
Performance & Accessibility
A Practical Guide to Scroll Performance
Keeping scrolling smooth by avoiding expensive work in scroll handlers and layout reads. Key takeaways Passive listeners: let the browser scroll without waiting...
Performance & Accessibility
Compositing and GPU Layers: The Decisions That Matter
How browsers split pages into layers that the GPU can move and blend without redrawing everything. Key takeaways Compositor properties: transform and opacity ca...
Performance & Accessibility
Field Debugging with the web-vitals Library: The Decisions That Matter
Collecting Core Web Vitals from real users in JavaScript, including attribution data that points at the cause. Key takeaways Library: Google publishes a web-vit...
Performance & Accessibility
A Practical Guide to Lighthouse in Continuous Integration
Running Lighthouse automatically on each build so performance and accessibility regressions are caught before release. Key takeaways Lighthouse CI: runs audits...
Performance & Accessibility
A Practical Guide to Accessible Authentication
WCAG 2.2 requirements that sign-in should not depend on remembering or transcribing information. Key takeaways Success Criterion 3.3.8: requires an alternative...
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