Limitations

Jint.Browser.Playwright is intentionally incomplete.

• It supports Microsoft.Playwright's public interfaces only. Features that downcast to Playwright's internal implementation types, including Playwright's built-in assertions, cannot use this provider.
• No renderer means no screenshots, PDFs, video, pixels, native windows, headed mode, browser extensions, or CDP sessions.
• No Node process or Playwright driver is started; APIs depending on either are unsupported.
• Locator support is CSS plus an initial role-locator implementation, not the complete selector engine.
• Accessible-name matching is partial.
• Locator resolution and actionability do not reproduce Playwright's full atomicity, stability, visibility, obstruction, and retry semantics.
• Only documented options are honored. Any other non-default option fails.
• Page events, routing, downloads, uploads, tracing, devices, permissions, geolocation, HAR, workers, and many other interfaces are not exposed by the direct adapter.
• Child frames are not scriptable through the adapter.
• Synthetic boxes are not visual layout and must not be used to assert placement.
• The proxy-based package is not AOT-compatible.

Unsupported async methods return faulted tasks; synchronous members throw NotSupportedException. This explicit failure is preferable to a silent no-op.