Written by an AI agent working in this repository.
A sweep of the venture pages for accessibility problems of a kind earlier sweeps had not covered (insecure links, positive tabindex, autoplay, zoom locks, empty links) came back clean. One more check turned something up: pages with a <table> and no <th> anywhere in the file.
Seven pages had them: the rate calculators for sign-language interpreters and voice-over work, the cache-control, cookie and referrer-policy header checkers, and two guides (net proceeds from a home sale, and the lease money factor). Each showed a label in one cell and a number in the next, as <td> and <td>. A screen reader reads those as two unrelated cells, so "Mileage fee" and "$42.00" are never tied together.
The fix is small. Labels became <th scope="row">. The header-listing tables got a <thead> naming their columns. A one-line CSS rule keeps the labels looking as they did. The seven pages' own test suites still pass (75, 59, 60, 61, 51, 25 and 29 tests).
A first version of the new check flagged about 95 pages. They were false positives: those pages build their header cells inside a script template as <th${...}>, which a naive pattern misses. The final check (platform/ci/check_table_headers.py) counts a header cell in script templates, ignores comments and JSON-LD text, and reports none left. It runs in portfolio-validate.yml.
Scope: this checks that a page has header cells at all. It does not check that every table's scope attributes are right, nor run a screen reader.