puppeteer/assets/js/271b3a47.b72de782.js

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page.",source:"@site/versioned_docs/version-21.3.1/api/puppeteer.page.emulatevisiondeficiency.md",sourceDirName:"api",slug:"/api/puppeteer.page.emulatevisiondeficiency",permalink:"/api/puppeteer.page.emulatevisiondeficiency",draft:!1,tags:[],version:"21.3.1",frontMatter:{sidebar_label:"Page.emulateVisionDeficiency"},sidebar:"api",previous:{title:"Page.emulateTimezone",permalink:"/api/puppeteer.page.emulatetimezone"},next:{title:"Page.evaluate",permalink:"/api/puppeteer.page.evaluate"}},c={},u=[{value:"Signature:",id:"signature",level:4},{value:"Parameters",id:"parameters",level:2},{value:"Example",id:"example",level:2}],s={toc:u};function m(e){var{components:t}=e,n=i(e,["components"]);return(0,r.kt)("wrapper",a({},s,n,{components:t,mdxType:"MDXLayout"}),(0,r.kt)("h1",a({},{id:"pageemulatevisiondeficiency-method"}),"Page.emulateVisionDeficiency() method"),(0,r.kt)("p",null,"Simulates the given vision deficiency on the page."),(0,r.kt)("h4",a({},{id:"signature"}),"Signature:"),(0,r.kt)("pre",null,(0,r.kt)("code",a({parentName:"pre"},{className:"language-typescript"}),"class Page {\n  emulateVisionDeficiency(\n    type?: Protocol.Emulation.SetEmulatedVisionDeficiencyRequest['type']\n  ): Promise<void>;\n}\n")),(0,r.kt)("h2",a({},{id:"parameters"}),"Parameters"),(0,r.kt)("table",null,(0,r.kt)("thead",{parentName:"table"},(0,r.kt)("tr",{parentName:"thead"},(0,r.kt)("th",a({parentName:"tr"},{align:null}),"Parameter"),(0,r.kt)("th",a({parentName:"tr"},{align:null}),"Type"),(0,r.kt)("th",a({parentName:"tr"},{align:null}),"Description"))),(0,r.kt)("tbody",{parentName:"table"},(0,r.kt)("tr",{parentName:"tbody"},(0,r.kt)("td",a({parentName:"tr"},{align:null}),"type"),(0,r.kt)("td",a({parentName:"tr"},{align:null}),"Protocol.Emulation.SetEmulatedVisionDeficiencyRequest","[","'type'","]"),(0,r.kt)("td",a({parentName:"tr"},{align:null}),(0,r.kt)("em",{parentName:"td"},"(Optional)")," the type of deficiency to simulate, or ",(0,r.kt)("code",null,"'none'")," to reset.")))),(0,r.kt)("p",null,(0,r.kt)("strong",{parentName:"p"},"Returns:")),(0,r.kt)("p",null,"Promise","<","void",">"),(0,r.kt)("h2",a({},{id:"example"}),"Example"),(0,r.kt)("pre",null,(0,r.kt)("code",a({parentName:"pre"},{className:"language-ts"}),"import puppeteer from 'puppeteer';\n\n(async () => {\n  const browser = await puppeteer.launch();\n  const page = await browser.newPage();\n  await page.goto('https://v8.dev/blog/10-years');\n\n  await page.emulateVisionDeficiency('achromatopsia');\n  await page.screenshot({path: 'achromatopsia.png'});\n\n  await page.emulateVisionDeficiency('deuteranopia');\n  await page.screenshot({path: 'deuteranopia.png'});\n\n  await page.emulateVisionDeficiency('blurredVision');\n  await page.screenshot({path: 'blurred-vision.png'});\n\n  await browser.close();\n})();\n")))}m.isMDXComponent=!0}}]);