microsoft/playwright · error · Error

Method not implemented.

Error message

Method not implemented.

What it means

Error "Method not implemented." thrown in microsoft/playwright.

Source

Thrown at packages/playwright-core/src/server/webkit/webview/wvPage.ts:112

      eventsHelper.addEventListener(outerSession, 'Target.dispatchMessageFromTarget', this._onDispatchMessageFromTarget.bind(this)),
      eventsHelper.addEventListener(outerSession, 'Target.didCommitProvisionalTarget', this._onDidCommitProvisionalTarget.bind(this)),
    ];
    this._firstNonInitialNavigationCommittedPromise = new Promise((f, r) => {
      this._firstNonInitialNavigationCommittedFulfill = f;
      this._firstNonInitialNavigationCommittedReject = r;
    });
    // Avoid unhandled rejection on disconnect in the middle of initialization.
    this._firstNonInitialNavigationCommittedPromise.catch(() => {});

    this._dialogHandler = syncServer?.addHandler(body => this._onBridgeDialog(body));
  }

  waitForInitialized(): Promise<void> {
    return this._initializedPromise;
  }

  updateEmulatedViewportSize(preserveWindowBoundaries?: boolean): Promise<void> {
    throw new Error('Method not implemented.');
  }

  private static async _setEmulateMedia(session: WVSession, mediaType: types.MediaType, colorScheme: types.ColorScheme, reducedMotion: types.ReducedMotion, contrast: types.Contrast): Promise<void> {
    const promises = [];
    promises.push(session.send('Page.setEmulatedMedia', { media: mediaType === 'no-override' ? '' : mediaType }));
    let appearance: any = undefined;
    switch (colorScheme) {
      case 'light': appearance = 'Light'; break;
      case 'dark': appearance = 'Dark'; break;
      case 'no-override': appearance = undefined; break;
    }
    promises.push(session.send('Page.overrideUserPreference', { name: 'PrefersColorScheme', value: appearance }));
    let reducedMotionWk: any = undefined;
    switch (reducedMotion) {
      case 'reduce': reducedMotionWk = 'Reduce'; break;
      case 'no-preference': reducedMotionWk = 'NoPreference'; break;
      case 'no-override': reducedMotionWk = undefined; break;
    }

View on GitHub (pinned to c8fc3bf8d3)

When it happens

Trigger: Thrown at packages/playwright-core/src/server/webkit/webview/wvPage.ts:112 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/playwright@c8fc3bf8d3 (2026-08-12). Data as JSON: /api/errors/ad70d22f27787b22. Report an issue: GitHub.