A Marketplace Audit Fixes the Platform and Every Listing

What We Keep Finding

Marketplaces have a problem single-brand stores do not. Most of the content is not yours. Sellers upload the photos, write the titles, and skip the alt text, and auditing your own pages cannot reach what a seller publishes tomorrow. So the answer is not reviewing a million listings. It is auditing the machine that makes them, which means your templates, your listing form, and the defaults underneath both.

The standard has an actual answer for content you do not write, and it gives you two routes and no others. Either you monitor that content and repair what breaks within two business days, in which case you can still claim conformance. Or you publish a statement of partial conformance, naming the parts you do not control clearly enough for a shopper to recognise them. What you cannot do is carve seller listings out and claim the rest, because excluding part of a page from a claim is forbidden outright. Two business days is a real operational target, and deciding whether you can hit it is a better conversation than deciding how many listings to review.

One warning about the obvious fix, because it backfires at scale. Making alt text a required field on the seller form produces a site full of alt text repeating the title that already sits above the photo. A screen reader then says the same words twice on every listing. W3C's own decision tree sends that case to empty alt text. The better default derives empty alt where the visible title already carries the information, and asks the seller for a description only where the photo adds something the words do not. That is a smaller change to your form and a much better result on the page.