puppeteer/docs/api/puppeteer.page.emulatevisiondeficiency.md
2022-07-05 15:41:43 +02:00

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Page.emulateVisionDeficiency

Page.emulateVisionDeficiency() method

Simulates the given vision deficiency on the page.

Signature:

class Page {
  emulateVisionDeficiency(
    type?: Protocol.Emulation.SetEmulatedVisionDeficiencyRequest['type']
  ): Promise<void>;
}

Parameters

Parameter Type Description
type Protocol.Emulation.SetEmulatedVisionDeficiencyRequest['type'] (Optional) the type of deficiency to simulate, or 'none' to reset.

Returns:

Promise<void>

Example

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto('https://v8.dev/blog/10-years');

  await page.emulateVisionDeficiency('achromatopsia');
  await page.screenshot({path: 'achromatopsia.png'});

  await page.emulateVisionDeficiency('deuteranopia');
  await page.screenshot({path: 'deuteranopia.png'});

  await page.emulateVisionDeficiency('blurredVision');
  await page.screenshot({path: 'blurred-vision.png'});

  await browser.close();
})();