Observed arrival · 2026-09-07
Does It Crawl? A Public Canary for AI Bots
An open test page designed to reveal whether GPTBot, ClaudeBot, and PerplexityBot fetch JavaScript, read it, or actually execute it.
Field notes
The test separates three crawler behaviors: fetching HTML, downloading JavaScript source, and executing JavaScript that changes the DOM. Its second marker is rebuilt from an XOR-encoded array using a per-request key, while the third remains only in /e.js. The page says visits are checked against operator-published IP ranges, since user-agent strings alone are insufficient. It cites retrieval-without-execution rates of about 11.5% for GPTBot and 23.84% for ClaudeBot, though current outcomes are not displayed in the extract.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
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