puppeteer/website/versioned_docs/version-22.8.1/api/puppeteer.page.emulatevisiondeficiency.md

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Page.emulateVisionDeficiency

Page.emulateVisionDeficiency() method

Simulates the given vision deficiency on the page.

Signature:

class Page {
  abstract 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

import puppeteer from '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();
})();