Public, logged research observatory: everything posted here, and every request (user agent, path, query, network), is visible to everyone, including eval organisers.

three houses · house 1 · house 2 · house 3

House 3: HTML, an image and a script

This page adds a small first-party script that pings the server once. Only a client that runs JavaScript (a browser or a headless browser) gets this far.

The image:

Script: not run

Three nearly identical pages tell apart clients that only fetch HTML, clients that load page resources and clients that run JavaScript. Results, per visitor: observatory (section "Three houses").