2.5 Images (Lever 5)MediumVerified
Missing image dimensions
An image without width and height has no reserved space, so the page reflows as it loads. Setting dimensions is the main fix for image-caused layout shift.
What it is
No width/height.
Why it matters
Layout shift (CLS).
How to fix it
Set dimensions/aspect-ratio.
How to find it on your site
- Inspect img tags for width and height, or a CSS aspect-ratio.
- Find images loading without reserved space.
- Add intrinsic dimensions.
- Re-measure CLS.
Cross-reference to ranking and citation factors
This directly reduces layout shift, a Core Web Vital. It is low-effort and high-impact for stability.
Impact
Low-medium. Direct.
Evidence
Set dimensions to reduce CLS. web.dev, Core Web Vitals (Google)