vital-scans open quality ledger

www.cdc.gov: image inventory

Unique images encountered on scanned pages in 2026-W28, deduplicated by URL and Alt — the same image reused across pages with the same explanation is one row. Images with alternate captions are split into separate rows.

Image alt-text coverage across 1783 page(s) scanned in 2026-W28.
CategoryCountShare
Total image occurrences29158—
Unique images3545—
Has alt text2290179%
Decorative (alt="")616721%
Missing alt attribute900%

Alt-text quality

Beyond present-vs-missing, each unique image's alt text is classified for quality. Filenames, redundant phrasing ("image of…"), and too-short or too-long values are technically present but unhelpful — the cases a human should rewrite. Decorative and "looks good" are not problems.

Alt-text quality across 3545 unique image(s).
VerdictImagesShareWhat it means
Missing alt531%No alt attribute — a screen reader may announce the filename.
Filename as alt10%The alt text looks like a filename (e.g. hero_1234.jpg), not a description.
Redundant / meaningless1103%Phrases like "image of…" or bare values like "photo" add nothing.
Too long2317%So long it probably belongs in a caption or a separate description.
Looks good254572%Present, plausible, no red flags (still worth a human spot-check).
Decorative60517%alt="" or aria-hidden — intentionally not announced. Not a problem.

Image detail

Up to 500 unique image occurrences from 1783 page(s) scanned, most-reused first. — click a column heading to sort