Optimize CSS processing and modernize vendor prefix handling#7
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SteedMonteiro merged 3 commits intomainfrom Feb 22, 2026
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- Remove document.createElement at module init (SSR-safe) - Cache CSS.supports() results to avoid repeated queries - Remove obsolete vendor prefixes for modern browsers - Optimize CSS variable generation: single-pass, minified - Single-pass prop classification in extractUtilityClasses - Fast serialization in hashStyleProps (skip JSON.stringify) - Single-pass prop filtering in Element.tsx - Pre-compute media queries in processStyles - Add sideEffects: false for better tree-shaking Bundle size: CJS 24.12->23.52KB, ESM 23.92->23.31KB, UMD 24.36->23.74KB (~2.5% reduction) https://claude.ai/code/session_01MXi5KgyqXXzTFQ5Di811uz
size-limit report 📦
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Integrated upstream htmlOnlyAttributes and useMemo removal with our perf optimizations (cssSupportCache, fast hash). https://claude.ai/code/session_01MXi5KgyqXXzTFQ5Di811uz
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Summary
This PR optimizes CSS processing performance and modernizes vendor prefix support by removing outdated prefixes for older browsers and streamlining CSS variable normalization logic.
Key Changes
Vendor Prefix Modernization (
src/utils/vendorPrefixes.ts):-moz-prefixes (Firefox 91+ supports unprefixed properties)-ms-prefixes (IE/Edge Legacy no longer supported)-o-prefixes (Opera uses Blink engine)-webkit-prefixes for Safari/WebKit compatibilityCSS Value Normalization (
src/element/css.ts):charCodeAt()for performanceTheme CSS Generation (
src/providers/Theme.tsx):generateCSSVariables()for single-pass processingElement Rendering (
src/element/Element.tsx):styleRelevantPropsSet for efficient prop filteringStyle Utilities (
src/utils/style.ts):Build Configuration (
package.json):"sideEffects": falsefor better tree-shaking supportImplementation Details
https://claude.ai/code/session_01MXi5KgyqXXzTFQ5Di811uz