microsoft/playwright · error · Error

css screenshots are not implemented

Error message

css screenshots are not implemented

What it means

Error "css screenshots are not implemented" thrown in microsoft/playwright.

Source

Thrown at packages/playwright-core/src/server/webkit/webview/wvPage.ts:783

    throw new Error('Method not implemented');
  }

  private validateScreenshotDimension(side: number, omitDeviceScaleFactor: boolean) {
    // Cairo based implementations (Linux and Windows) have hard limit of 32767
    // (see https://github.com/microsoft/playwright/issues/16727).
    if (process.platform === 'darwin')
      return;
    if (!omitDeviceScaleFactor && this._page.browserContext._options.deviceScaleFactor)
      side = Math.ceil(side * this._page.browserContext._options.deviceScaleFactor);
    if (side > 32767)
      throw new Error('Cannot take screenshot larger than 32767 pixels on any dimension');
  }

  async takeScreenshot(progress: Progress, format: string, documentRect: types.Rect | undefined, viewportRect: types.Rect | undefined, quality: number | undefined, fitsViewport: boolean, scale: 'css' | 'device'): Promise<Buffer> {
    const rect = (documentRect || viewportRect)!;
    const omitDeviceScaleFactor = scale === 'css';
    if (omitDeviceScaleFactor)
      throw new Error('css screenshots are not implemented');
    this.validateScreenshotDimension(rect.width, omitDeviceScaleFactor);
    this.validateScreenshotDimension(rect.height, omitDeviceScaleFactor);
    const result = await progress.race(this._session.send('Page.snapshotRect', { ...rect, coordinateSystem: documentRect ? 'Page' : 'Viewport' }));
    const prefix = 'data:image/png;base64,';
    let buffer: Buffer = Buffer.from(result.dataURL.substr(prefix.length), 'base64');
    if (format === 'jpeg') {
      buffer = jpegjs.encode(PNG.sync.read(buffer), quality).data;
    } else if (format === 'webp') {
      const png = PNG.sync.read(buffer);
      // Match the native WebKit encoder: webp quality 100 (or omitted) is lossless.
      buffer = (quality === undefined || quality >= 100) ? encodeWebp(png, { lossless: true }) : encodeWebp(png, { quality });
    }
    return buffer;
  }

  async getContentFrame(handle: dom.ElementHandle): Promise<frames.Frame | null> {
    if (!handle._objectId)
      return null;

View on GitHub (pinned to c8fc3bf8d3)

When it happens

Trigger: Thrown at packages/playwright-core/src/server/webkit/webview/wvPage.ts:783 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/dbd9c552e803fdb3. Report an issue: GitHub.