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Hypertext Markup Language — the standard markup language for documents designed to be displayed in a web browser.

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CSP form-action also blocks the redirect after a form POST, and Chrome's error names the wrong URL

CSP form-action also blocks the redirect after a form POST, and Chrome's error names the wrong URL

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6 min read
How we keep 56,000 browser games playable on low-end devices

How we keep 56,000 browser games playable on low-end devices

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2 min read
Web Accessibility: Semantic HTML, ARIA, Keyboard Navigation, and Testing

Web Accessibility: Semantic HTML, ARIA, Keyboard Navigation, and Testing

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5 min read
Modern CSS in 2024: Nesting, :has(), Container Queries, color-mix(), and More

Modern CSS in 2024: Nesting, :has(), Container Queries, color-mix(), and More

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3 min read
CSS Flexbox Advanced: flex-grow vs flex-basis, Auto Margins, and the Firefox Flex Inspector

CSS Flexbox Advanced: flex-grow vs flex-basis, Auto Margins, and the Firefox Flex Inspector

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3 min read
Web Accessibility with Firefox DevTools: Auditing ARIA, Contrast, and Keyboard Navigation

Web Accessibility with Firefox DevTools: Auditing ARIA, Contrast, and Keyboard Navigation

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4 min read
CSS Cascade Layers (@layer): End Specificity Wars Forever

CSS Cascade Layers (@layer): End Specificity Wars Forever

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3 min read
HTML5 Form Validation: Native API, Custom Messages, and Accessible Errors

HTML5 Form Validation: Native API, Custom Messages, and Accessible Errors

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4 min read
CSS Grid Advanced: Named Lines, Subgrid, auto-fit, and the Firefox Inspector

CSS Grid Advanced: Named Lines, Subgrid, auto-fit, and the Firefox Inspector

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4 min read
History API for SPAs: pushState, popstate, Scroll Restoration, URLSearchParams, and Nginx Config

History API for SPAs: pushState, popstate, Scroll Restoration, URLSearchParams, and Nginx Config

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3 min read
HTML5 Constraint Validation API: setCustomValidity, checkValidity, Real-Time Validation, Accessibility

HTML5 Constraint Validation API: setCustomValidity, checkValidity, Real-Time Validation, Accessibility

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4 min read
Why Your og:image Works in the Browser but Not for Crawlers: Relative Paths, Redirects and Wrong Content-Types

Why Your og:image Works in the Browser but Not for Crawlers: Relative Paths, Redirects and Wrong Content-Types

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5 min read
A clickable control and an anchor are different audit records

A clickable control and an anchor are different audit records

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2 min read
What Is a VTT File? The WebVTT Format, an Example, and What Browsers Actually Show

What Is a VTT File? The WebVTT Format, an Example, and What Browsers Actually Show

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9 min read
Website Accessibility: 7 Practical Improvements Every Developer Should Make

Website Accessibility: 7 Practical Improvements Every Developer Should Make

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3 min read
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