The year was 2010. Amazon.com, already a titan of e-commerce, decided to overhaul its product page navigation. Their goal: reduce user frustration and bounce rates by making it unequivocally clear where a customer stood within their vast catalog. Instead of relying on complex JavaScript frameworks that often introduced lag and accessibility woes, their internal UI team, led by then-Senior Engineer Marcus Thorne, opted for a lean, semantic HTML structure styled almost entirely with CSS. It wasn't flashy, but it was fast, robust, and universally understood. Thorne famously quipped in an internal memo, "If it can be done with a `