Summary

• Preserve browser-valid CSS math values during CSS value parsing when css-tree can parse the value but cannot fully validate the property syntax.
• Fix pasted HTML/imported inline styles like nested clamp() + calc() font sizes being marked invalid.
• Keep malformed math values and numeric functions in non-numeric properties invalid.
• Add regression coverage for CSS value parsing and HTML paste/import behavior.

Testing

• pnpm --filter @webstudio-is/css-data test src/parse-css-value.test.ts
• pnpm --filter @webstudio-is/builder test app/shared/html.test.tsx app/shared/tailwind/tailwind.test.tsx

Notes

This prevents valid pasted CSS math expressions from becoming invalid style values and crashing the builder on import.