Oracle #

Long-lived multi-browser geometry service. Speaks newline-delimited JSON on stdio, per docs/dump-format.md.

Run #

node oracle.mjs [--engines=chromium,firefox,webkit]

Launches one persistent browser/context/page per engine (default: all three), reads one JSON request per line from stdin, writes one JSON response per line to stdout. Diagnostics go to stderr. Send {"id":"1","op":"ping"} or {"id":"1","op":"shutdown"} for control, {"id":"1","html":"...","engines":[...]} for a dump.

Selftest #

node selftest.mjs [--engines=chromium,firefox,webkit]

Spawns the oracle, drives ping plus a few small HTML cases, prints PASS/FAIL per check, exits non-zero on failure.