Customers must not have to re-enter information they already provided

The check runs only on checkout and account pages. It sorts visible, enabled address fields into a billing and a shipping block, using keywords in five languages found in the field’s own attributes and label, then in up to ten surrounding containers, then in the nearest preceding heading or legend. Each block needs at least two fields such as street, postal code, city, country or region; name, email and phone fields alone do not make one.

When both blocks are shown, the page passes if an enabled checkbox, radio button, switch, select, button or link that is not hidden from assistive technology pairs a word such as “same”, “copy” or “different” with an address word. “Same day” delivery options do not count. Otherwise one finding is placed on the billing block. A billing block hidden until requested is not counted.

Field values are not read, so the check cannot tell whether billing fields arrive pre-filled. A scan never goes past the first checkout step.