Angle Unit Bugs in Frontend Code: A QA Checklist for Developers

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Angle conversion errors are among the most silent bugs in frontend development, producing incorrect geometry without throwing exceptions or alerts. Different rendering surfaces — Canvas, SVG, CSS, and libraries like Three.js — each use different default angle units, making cross-surface mistakes easy to introduce. A practical QA checklist recommends searching pull requests for conversion fingerprints like Math.PI or multiplications by 180, and ensuring every angle constant is explicitly named with its unit. Developers are advised to establish a single source of truth for angle units across a codebase and convert only at system boundaries. Standardising these conventions through lint rules can eliminate the entire bug class rather than requiring repeated one-off fixes.

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