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Limitations

Rustwright is an alpha, not a complete Playwright replacement.

  • Chromium only. Firefox and WebKit entry points currently raise unsupported browser errors.
  • Playwright wire endpoints from playwright run-server and BrowserType.launchServer() are unsupported. Remote Chromium requires raw CDP through chromium.connect_over_cdp(). HTTP discovery can identify a Playwright endpoint definitively. Direct WebSocket detection is heuristic and can only report that the first reply resembles Playwright wire. See docs/REMOTE_BROWSERS.md.
  • Behavioral parity is not fully proven. Rustwright exposes a broad Playwright-shaped API, but API-surface coverage is not the same as complete browser behavior parity.
  • Async support currently wraps the sync implementation through Python thread execution. It is not recommended above roughly 25 concurrent workflows per process. Native async is planned; see docs/async-design.md.
  • OOPIF support is new. Cross-origin frame locator actions work in covered cases, but non-main-frame remote JSHandle follow-up operations remain a gap, and drag, screenshot, and bounding-box behavior in OOPIFs is not yet claimed as full parity.
  • Anti-bot and stealth behavior is partial. Rustwright suppresses some common automation signals, but recent public fingerprint checks were only clean on about 2 of 4 targets. Rustwright does not promise undetectability.
  • Drop-in compatibility import names are intended to be opt-in for the public alpha. The final compatibility-mode API is being finalized separately.
  • Chromium security-masks window ErrorEvent detail (message='Script error.', error=null) for asynchronous callbacks created by inspector-compiled Runtime.callFunctionOn declarations. With Runtime.enable disabled (Rustwright's stealth default), passive page-error history does not promise full detail for errors thrown by evaluate-created async callbacks. Same-origin, same-document page-authored scripts retain full detail. Standard web-platform cross-origin masking still applies to external scripts loaded without CORS. Subscribing to the pageerror event enables the Runtime domain and provides full detail for evaluate-created asynchronous callbacks.
  • The implementation still has large monolithic files. A module split is planned before beta.