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dimensions

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Use when reviewing image assets, markup, and CDN or build transforms related to Set explicit width and height on images. Check encoded size, rendered size, loading strategy, and above-the-fold impact together. Separate real CLS risks from tiny decorative SVGs or ornament-only assets that are unlikely to move surrounding content.

skills/dimensions/SKILL.md

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# Set explicit width and height on images

Images without explicit dimensions are the most common cause of Cumulative Layout Shift (CLS), a Core Web Vitals metric. When images load and cause layout jumps, users accidentally click the wrong element—a frustrating experience that Google penalises in search rankings. A CLS score above 0.1 is considered 'needs improvement'; above 0.25 is 'poor'.

## Quick Reference

- Reserve findings for meaningful content images; decorative micro-SVGs or ornament-only assets are low-priority exceptions when CSS already reserves stable space
- Example low-risk exception: `<img src="/divider.svg" alt="" aria-hidden="true">` should not be flagged on its own without evidence of visible layout shift
- Always set `width` and `height` attributes on `<img>` matching the image's intrinsic dimensions
- Pair with `height: auto` in CSS to keep the image fluid while preserving the aspect ratio
- Missing dimensions are the leading cause of Cumulative Layout Shift (CLS) from images
- Browsers derive `aspect-ratio` from these attributes—do not set arbitrary placeholder values

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