vital-scans open quality ledger

www.cdc.gov: image inventory

Unique images encountered on scanned pages in 2026-W36, 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 2959 page(s) scanned in 2026-W36.
CategoryCountShare
Total image occurrences46989—
Unique images5584—
Has alt text3692179%
Decorative (alt="")984421%
Missing alt attribute2240%

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 5584 unique image(s).
VerdictImagesShareWhat it means
Missing alt1673%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 / meaningless1563%Phrases like "image of…" or bare values like "photo" add nothing.
Too short70%A single character or word unlikely to convey the image's meaning.
Too long3336%So long it probably belongs in a caption or a separate description.
Looks good402172%Present, plausible, no red flags (still worth a human spot-check).
Decorative89916%alt="" or aria-hidden — intentionally not announced. Not a problem.

Image detail

Up to 500 unique image occurrences from 2959 page(s) scanned, most-reused first. — click a column heading to sort