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name: retina-display description: "Use when reviewing image assets, markup, and CDN or build transforms related to Support high-DPI retina displays. Check encoded size, rendered size, loading strategy, and above-the-fold impact together." metadata: category: images priority: medium difficulty: intermediate estimatedTime: "15" source: frontendchecklist.io url: https://frontendchecklist.io/rules/images/retina-display

Support high-DPI retina displays

Standard images look blurry on retina displays (2x, 3x pixel density)—high-resolution assets ensure sharp visuals on modern devices.

Quick Reference

• Provide 2x and 3x images for high-DPI displays
• Use srcset with x descriptors for fixed-size images
• Use srcset with w descriptors for responsive images
• CSS background-image: use image-set() or media queries

Check

Check if high-resolution images are provided for retina displays (2x, 3x).

Fix

Add retina-ready images using srcset or CSS image-set for high-DPI displays.

Explain

Explain how retina images ensure sharp visuals on high-density displays.

Code Review

Review image assets, markup, and delivery configuration related to Support high-DPI retina displays. Flag exact files or components where format choice, sizing, or loading behavior violates the rule, and describe how to confirm the fix in DevTools.

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For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/rules/images/retina-display