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CDP / Playwright smoke

Run the committed smoke with:

mise install
just cdp-playwright-smoke

The script starts vixen-headless --cdp, connects with playwright-core, and exercises:

  1. Playwright's chromium.connectOverCDP(...) handshake.
  2. Runtime.enable, Page.enable, Network.enable, Target.getTargets, Page.getFrameTree.
  3. Page.navigate to a local fixture with a button click listener, including Playwright page.addInitScript() execution before page scripts.
  4. Runtime.evaluate / Runtime.awaitPromise for DOM reads and promise handles.
  5. CDP DOM query plumbing: DOM.getDocument, DOM.querySelector, DOM.querySelectorAll, DOM.describeNode, and DOM.resolveNode.
  6. Top-level navigation network notifications: Network.requestWillBeSent, Network.responseReceived, and Network.loadingFinished; lifecycle opt-in observes init / commit / DOMContentLoaded / load.
  7. Input.dispatchMouseEvent with mousePressed then mouseReleased over the button.
  8. The click handler mutates textContent, attributes/classes, inline style, and a small createElement/appendChild/removeChild/replaceChildren structural subtree; later Runtime.evaluate calls read those mutations back.
  9. Observe Runtime.consoleAPICalled, then call Page.captureScreenshot (png) and Playwright's high-level page.screenshot() path.
  10. Playwright page.setViewportSize() plus CDP Page.getLayoutMetrics viewport reporting, page-level viewport globals, and page.emulateMedia() updates to matchMedia() for media type/color scheme.
  11. Exercise high-level locator geometry/click/fill APIs over Vixen's minimal DOM.describeNode / DOM.resolveNode / DOM.getContentQuads backing. The smoke also covers locator.hover() mouse lifecycle events, locator.dblclick() click/detail ordering, right-click contextmenu, page.mouse.wheel() wheel-event deltas, getByRole() button lookup by accessible text, getByLabel() lookup/check/select/fill through DOM label/control associations, high-level Playwright keyboard input against a clicked form control, and locator.setInputFiles() against a file input.
  12. Submit a form through Playwright's high-level locator click and wait for the resulting URL/title navigation.
  13. Traverse session history with Playwright page.goBack() / page.goForward() and refresh with page.reload().
  14. Replace document content with Playwright page.setContent().
  15. Execute/apply dynamic inline scripts and styles inserted by Playwright page.addScriptTag() / page.addStyleTag().
  16. Deliver exposed function calls through Playwright page.exposeFunction().
  17. Create and close additional pages with Playwright context.newPage() / page.close().
  18. Read object properties through Playwright JSHandle.getProperty().
  19. Surface modal dialogs through Playwright's dialog event.
  20. Replace and clear browser-context permission grants through Playwright context.grantPermissions() / context.clearPermissions(), with runtime PermissionStatus reads observing the override without rewriting profile decisions.
  21. Start/stop Chromium tracing through Playwright browser.startTracing() / browser.stopTracing(), read the bounded JSON trace through IO.read, and verify stable cdp.method-not-found errors for unsupported methods.

Rust CDP tests additionally cover browser-shaped automation methods used by Playwright/DevTools probes: idle Page.stopLoading, Page.resetNavigationHistory, Page.getResourceTree, Page.getResourceContent, Page.setBypassCSP as a CDP-scoped script-CSP override for later navigations, Network.setCacheDisabled bypassing runtime fetch() cache reads/writes, Network.setBypassServiceWorker, Network.setExtraHTTPHeaders propagation into runtime fetch(), Performance.getMetrics, Security.getSecurityState, and DOM attribute/outerHTML read-write methods, exact/wildcard permission override scopes, detached-session rejection, stable protocol error data, and the bounded 4,096-event tracing buffer.

Current limits are intentional: one main frame per independently scripted target, PNG screenshots only, Chromium JSON tracing only (not Playwright context trace archives), synchronous per-request lifecycle waiting (therefore idle-only protocol stop-loading acknowledgement), and full-viewport mouse hit testing. BrowserCore itself has active source cancellation and stale-completion race tests; CDP needs an asynchronous event pump before the same connection can race Page.navigate with Page.stopLoading. Add methods only when this smoke shows a real automation gap.