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Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Nikolay Vitkov <nvitkov@chromium.org>
74 lines
1.2 KiB
Markdown
74 lines
1.2 KiB
Markdown
---
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sidebar_label: Page.emulateVisionDeficiency
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---
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# Page.emulateVisionDeficiency() method
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Simulates the given vision deficiency on the page.
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#### Signature:
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```typescript
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class Page {
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abstract emulateVisionDeficiency(
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type?: Protocol.Emulation.SetEmulatedVisionDeficiencyRequest['type']
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): Promise<void>;
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}
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```
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## Parameters
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<table><thead><tr><th>
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Parameter
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</th><th>
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Type
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</th><th>
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Description
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</th></tr></thead>
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<tbody><tr><td>
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type
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</td><td>
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Protocol.Emulation.SetEmulatedVisionDeficiencyRequest\['type'\]
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</td><td>
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_(Optional)_ the type of deficiency to simulate, or `'none'` to reset.
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</td></tr>
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</tbody></table>
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**Returns:**
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Promise<void>
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## Example
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```ts
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import puppeteer from 'puppeteer';
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(async () => {
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const browser = await puppeteer.launch();
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const page = await browser.newPage();
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await page.goto('https://v8.dev/blog/10-years');
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await page.emulateVisionDeficiency('achromatopsia');
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await page.screenshot({path: 'achromatopsia.png'});
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await page.emulateVisionDeficiency('deuteranopia');
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await page.screenshot({path: 'deuteranopia.png'});
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await page.emulateVisionDeficiency('blurredVision');
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await page.screenshot({path: 'blurred-vision.png'});
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await browser.close();
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})();
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```
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