How would you optimize and implement a full-bleed responsive hero image?
WHAT IT TESTS: responsive image delivery and performance budgeting across breakpoints. ANSWER OUTLINE: use srcset with AVIF/WebP, CSS object-fit cover, and width/height to prevent CLS. RED FLAG: serving one 4K JPEG as a background image with no size hints.
WHAT IT TESTS: whether you can balance visual quality with performance across a 7x viewport range by combining responsive image syntax, modern codecs, and layout stability techniques. ANSWER OUTLINE: specify width and height attributes for CLS mitigation; use picture or img with srcset and sizes to serve AVIF/WebP at appropriate resolutions; apply CSS object-fit cover and object-position for full-bleed framing; consider lazy loading or priority hints for LCP.
Read the original → developer.mozilla.org
- #responsive images
- #performance
- #core web vitals
- #css
- #frontend
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