Jakub Sawa

Senior technical SEO consultant, 25 years in the field (ex-Onet, ex-Agora/Gazeta Wyborcza). Independent owner of SAWA PROJEKT, co-founder of FratreSEO. Building JS SEO Lab as an open research instrument on what bots and LLM fetchers actually see when JavaScript renders content.

Rendering mode was the wrong axis

Vercel and MERJ already settled that batch crawlers don't execute JavaScript. So why was I building a 6-mode renderability experiment? Here's why I rebuilt it as a pattern-axis instead — and what the new test bed measures.

2026-05-18 Findings