Meridian Components

A distributor catalogue that breaks on command — the test target for ANANSI.

Every page below renders the same 48 parts. They differ only in how the markup is arranged, and the stylesheet deliberately styles the renamed classes too — so a breaking change looks identical to a human and is invisible to anything but a scraper. Point a collector at baseline, then at any other page.

Breaking

The selector stops matching. Nulls appear and schema validation catches it — the failure everyone demos.

No mutation (known-good)healthy catalogue · baseline
Rename .price to .product-price-v2CSS refactor / design-system rename · rename_price_class
Move stock text into a nested span[data-testid]component library upgrade · nest_stock
Swap the catalogue table for a div card gridstorefront redesign · table_to_cards
Defer catalogue rows behind client-side JSmigration to client-side rendering · lazy_load
Remove the minimum-order-quantity column entirelythe distributor stops publishing MOQ · drop_moq
Reorder table columnsA/B test on column order · reorder_columns

Silent

The selector still returns a clean, correctly typed, non-null value. It is simply the wrong one.

Emit the struck-through list price first, sharing the price classpromotion banner rollout · list_price_first
Inject a breadcrumb matching the part-title selectornavigation redesign reuses a content class · breadcrumb_title

Real event

The page is fine and the scraper is fine. The world changed. Healing here would be the bug.

Genuine supplier-wide promotion: every price drops 28%real catalogue repricing · repricing