puppeteer/assets/js/8eebe478.557b1c4b.js

"use strict";(self.webpackChunkwebsite=self.webpackChunkwebsite||[]).push([[11314],{3905:(e,t,a)=>{a.d(t,{Zo:()=>u,kt:()=>k});var n=a(67294);function r(e,t,a){return t in e?Object.defineProperty(e,t,{value:a,enumerable:!0,configurable:!0,writable:!0}):e[t]=a,e}function l(e,t){var a=Object.keys(e);if(Object.getOwnPropertySymbols){var n=Object.getOwnPropertySymbols(e);t&&(n=n.filter((function(t){return Object.getOwnPropertyDescriptor(e,t).enumerable}))),a.push.apply(a,n)}return a}function p(e){for(var t=1;t<arguments.length;t++){var a=null!=arguments[t]?arguments[t]:{};t%2?l(Object(a),!0).forEach((function(t){r(e,t,a[t])})):Object.getOwnPropertyDescriptors?Object.defineProperties(e,Object.getOwnPropertyDescriptors(a)):l(Object(a)).forEach((function(t){Object.defineProperty(e,t,Object.getOwnPropertyDescriptor(a,t))}))}return e}function i(e,t){if(null==e)return{};var a,n,r=function(e,t){if(null==e)return{};var a,n,r={},l=Object.keys(e);for(n=0;n<l.length;n++)a=l[n],t.indexOf(a)>=0||(r[a]=e[a]);return r}(e,t);if(Object.getOwnPropertySymbols){var l=Object.getOwnPropertySymbols(e);for(n=0;n<l.length;n++)a=l[n],t.indexOf(a)>=0||Object.prototype.propertyIsEnumerable.call(e,a)&&(r[a]=e[a])}return r}var o=n.createContext({}),d=function(e){var t=n.useContext(o),a=t;return e&&(a="function"==typeof e?e(t):p(p({},t),e)),a},u=function(e){var t=d(e.components);return n.createElement(o.Provider,{value:t},e.children)},s={inlineCode:"code",wrapper:function(e){var t=e.children;return n.createElement(n.Fragment,{},t)}},m=n.forwardRef((function(e,t){var a=e.components,r=e.mdxType,l=e.originalType,o=e.parentName,u=i(e,["components","mdxType","originalType","parentName"]),m=d(a),k=r,g=m["".concat(o,".").concat(k)]||m[k]||s[k]||l;return a?n.createElement(g,p(p({ref:t},u),{},{components:a})):n.createElement(g,p({ref:t},u))}));function k(e,t){var a=arguments,r=t&&t.mdxType;if("string"==typeof e||r){var l=a.length,p=new Array(l);p[0]=m;var i={};for(var o in t)hasOwnProperty.call(t,o)&&(i[o]=t[o]);i.originalType=e,i.mdxType="string"==typeof e?e:r,p[1]=i;for(var d=2;d<l;d++)p[d]=a[d];return n.createElement.apply(null,p)}return n.createElement.apply(null,a)}m.displayName="MDXCreateElement"},73192:(e,t,a)=>{a.r(t),a.d(t,{assets:()=>d,contentTitle:()=>i,default:()=>m,frontMatter:()=>p,metadata:()=>o,toc:()=>u});a(67294);var n=a(3905);function r(){return r=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var a=arguments[t];for(var n in a)Object.prototype.hasOwnProperty.call(a,n)&&(e[n]=a[n])}return e},r.apply(this,arguments)}function l(e,t){if(null==e)return{};var a,n,r=function(e,t){if(null==e)return{};var a,n,r={},l=Object.keys(e);for(n=0;n<l.length;n++)a=l[n],t.indexOf(a)>=0||(r[a]=e[a]);return r}(e,t);if(Object.getOwnPropertySymbols){var l=Object.getOwnPropertySymbols(e);for(n=0;n<l.length;n++)a=l[n],t.indexOf(a)>=0||Object.prototype.propertyIsEnumerable.call(e,a)&&(r[a]=e[a])}return r}const p={sidebar_label:"Page"},i="Page class",o={unversionedId:"api/puppeteer.page",id:"version-20.9.0/api/puppeteer.page",title:"Page class",description:"Page provides methods to interact with a single tab or extension background page in the browser.",source:"@site/versioned_docs/version-20.9.0/api/puppeteer.page.md",sourceDirName:"api",slug:"/api/puppeteer.page",permalink:"/api/puppeteer.page",draft:!1,tags:[],version:"20.9.0",frontMatter:{sidebar_label:"Page"},sidebar:"api",previous:{title:"BrowserContext.waitForTarget",permalink:"/api/puppeteer.browsercontext.waitfortarget"},next:{title:"Page.$",permalink:"/api/puppeteer.page._"}},d={},u=[{value:"Signature:",id:"signature",level:4},{value:"Remarks",id:"remarks",level:2},{value:"Example 1",id:"example-1",level:2},{value:"Example 2",id:"example-2",level:2},{value:"Properties",id:"properties",level:2},{value:"Methods",id:"methods",level:2}],s={toc:u};function m(e){var{components:t}=e,a=l(e,["components"]);return(0,n.kt)("wrapper",r({},s,a,{components:t,mdxType:"MDXLayout"}),(0,n.kt)("h1",r({},{id:"page-class"}),"Page class"),(0,n.kt)("p",null,"Page provides methods to interact with a single tab or ",(0,n.kt)("a",r({parentName:"p"},{href:"https://developer.chrome.com/extensions/background_pages"}),"extension background page")," in the browser."),(0,n.kt)("admonition",r({},{type:"note"}),(0,n.kt)("p",{parentName:"admonition"},"One Browser instance might have multiple Page instances.")),(0,n.kt)("h4",r({},{id:"signature"}),"Signature:"),(0,n.kt)("pre",null,(0,n.kt)("code",r({parentName:"pre"},{className:"language-typescript"}),"export declare class Page extends EventEmitter\n")),(0,n.kt)("p",null,(0,n.kt)("strong",{parentName:"p"},"Extends:")," ",(0,n.kt)("a",r({parentName:"p"},{href:"/api/puppeteer.eventemitter"}),"EventEmitter")),(0,n.kt)("h2",r({},{id:"remarks"}),"Remarks"),(0,n.kt)("p",null,"The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the ",(0,n.kt)("inlineCode",{parentName:"p"},"Page")," class."),(0,n.kt)("h2",r({},{id:"example-1"}),"Example 1"),(0,n.kt)("p",null,"This example creates a page, navigates it to a URL, and then saves a screenshot:"),(0,n.kt)("pre",null,(0,n.kt)("code",r({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://example.com');\n  await page.screenshot({path: 'screenshot.png'});\n  await browser.close();\n})();\n")),(0,n.kt)("p",null,"The Page class extends from Puppeteer's ",(0,n.kt)("a",r({parentName:"p"},{href:"/api/puppeteer.eventemitter"}),"EventEmitter")," class and will emit various events which are documented in the ",(0,n.kt)("a",r({parentName:"p"},{href:"/api/puppeteer.pageemittedevents"}),"PageEmittedEvents")," enum."),(0,n.kt)("h2",r({},{id:"example-2"}),"Example 2"),(0,n.kt)("p",null,"This example logs a message for a single page ",(0,n.kt)("inlineCode",{parentName:"p"},"load")," event:"),(0,n.kt)("pre",null,(0,n.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"page.once('load', () => console.log('Page loaded!'));\n")),(0,n.kt)("p",null,"To unsubscribe from events use the ",(0,n.kt)("a",r({parentName:"p"},{href:"/api/puppeteer.page.off"}),"Page.off()")," method:"),(0,n.kt)("pre",null,(0,n.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"function logRequest(interceptedRequest) {\n  console.log('A request was made:', interceptedRequest.url());\n}\npage.on('request', logRequest);\n// Sometime later...\npage.off('request', logRequest);\n")),(0,n.kt)("h2",r({},{id:"properties"}),"Properties"),(0,n.kt)("table",null,(0,n.kt)("thead",{parentName:"table"},(0,n.kt)("tr",{parentName:"thead"},(0,n.kt)("th",r({parentName:"tr"},{align:null}),"Property"),(0,n.kt)("th",r({parentName:"tr"},{align:null}),"Modifiers"),(0,n.kt)("th",r({parentName:"tr"},{align:null}),"Type"),(0,n.kt)("th",r({parentName:"tr"},{align:null}),"Description"))),(0,n.kt)("tbody",{parentName:"table"},(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),"accessibility"),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("code",null,"readonly")),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.accessibility"}),"Accessibility")),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"The Accessibility class provides methods for inspecting the browser's accessibility tree. 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The high level api is ",(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.keyboard.type"}),"Keyboard.type()"),", which takes raw characters and generates proper keydown, keypress/input, and keyup events on your page.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),"mouse"),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("code",null,"readonly")),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.mouse"}),"Mouse")),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"The Mouse class operates in main-frame CSS pixels relative to the top-left corner of the viewport.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),"touchscreen"),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("code",null,"readonly")),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.touchscreen"}),"Touchscreen")),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"The Touchscreen class exposes touchscreen events.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),"tracing"),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("code",null,"readonly")),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.tracing"}),"Tracing")),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"The Tracing class exposes the tracing audit interface.")))),(0,n.kt)("h2",r({},{id:"methods"}),"Methods"),(0,n.kt)("table",null,(0,n.kt)("thead",{parentName:"table"},(0,n.kt)("tr",{parentName:"thead"},(0,n.kt)("th",r({parentName:"tr"},{align:null}),"Method"),(0,n.kt)("th",r({parentName:"tr"},{align:null}),"Modifiers"),(0,n.kt)("th",r({parentName:"tr"},{align:null}),"Description"))),(0,n.kt)("tbody",{parentName:"table"},(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page._"}),"$(selector)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Runs ",(0,n.kt)("code",null,"document.querySelector")," within the page. If no element matches the selector, the return value resolves to ",(0,n.kt)("code",null,"null"),".")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.__"}),"$$(selector)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"The method runs ",(0,n.kt)("code",null,"document.querySelectorAll")," within the page. If no elements match the selector, the return value resolves to ",(0,n.kt)("code",null,"[]"),".")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.__eval"}),"$$eval(selector, pageFunction, args)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"This method runs ",(0,n.kt)("code",null,"Array.from(document.querySelectorAll(selector))")," within the page and passes the result as the first argument to the ",(0,n.kt)("code",null,"pageFunction"),".")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page._eval"}),"$eval(selector, pageFunction, args)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"This method runs ",(0,n.kt)("code",null,"document.querySelector")," within the page and passes the result as the first argument to the ",(0,n.kt)("code",null,"pageFunction"),".")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page._x"}),"$x(expression)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"The method evaluates the XPath expression relative to the page document as its context node. If there are no such elements, the method resolves to an empty array.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.addscripttag"}),"addScriptTag(options)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Adds a ",(0,n.kt)("code",null,"<","script",">")," tag into the page with the desired URL or content.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.addstyletag"}),"addStyleTag(options)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("p",null,"Adds a ",(0,n.kt)("code",null,"<","link rel=",'"',"stylesheet",'"',">")," tag into the page with the desired URL or a ",(0,n.kt)("code",null,"<","style type=",'"',"text/css",'"',">")," tag with the content."),(0,n.kt)("p",null,"Shortcut for ",(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.frame.addstyletag_1"}),"page.mainFrame().addStyleTag(options)"),"."))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.addstyletag_1"}),"addStyleTag(options)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.authenticate"}),"authenticate(credentials)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Provide credentials for ",(0,n.kt)("code",null,"HTTP authentication"),".")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.bringtofront"}),"bringToFront()")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Brings page to front (activates tab).")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.browser"}),"browser()")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Get the browser the page belongs to.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.browsercontext"}),"browserContext()")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Get the browser context that the page belongs to.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.click"}),"click(selector, options)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"This method fetches an element with ",(0,n.kt)("code",null,"selector"),", scrolls it into view if needed, and then uses ",(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page"}),"Page.mouse")," to click in the center of the element. If there's no element matching ",(0,n.kt)("code",null,"selector"),", the method throws an error.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.close"}),"close(options)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.content"}),"content()")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"The full HTML contents of the page, including the DOCTYPE.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.cookies"}),"cookies(urls)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"If no URLs are specified, this method returns cookies for the current page URL. If URLs are specified, only cookies for those URLs are returned.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.createpdfstream"}),"createPDFStream(options)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Generates a PDF of the page with the ",(0,n.kt)("code",null,"print")," CSS media type.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.deletecookie"}),"deleteCookie(cookies)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.emulate"}),"emulate(device)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("p",null,"Emulates a given device's metrics and user agent."),(0,n.kt)("p",null,"To aid emulation, Puppeteer provides a list of known devices that can be via ",(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.knowndevices"}),"KnownDevices"),"."))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.emulatecputhrottling"}),"emulateCPUThrottling(factor)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Enables CPU throttling to emulate slow CPUs.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.emulateidlestate"}),"emulateIdleState(overrides)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Emulates the idle state. If no arguments set, clears idle state emulation.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.emulatemediafeatures"}),"emulateMediaFeatures(features)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.emulatemediatype"}),"emulateMediaType(type)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.emulatenetworkconditions"}),"emulateNetworkConditions(networkConditions)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("p",null,"This does not affect WebSockets and WebRTC PeerConnections (see ",(0,n.kt)("a",r({parentName:"td"},{href:"https://crbug.com/563644"}),"https://crbug.com/563644"),"). To set the page offline, you can use ",(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.setofflinemode"}),"Page.setOfflineMode()"),"."),(0,n.kt)("p",null,"A list of predefined network conditions can be used by importing ",(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.predefinednetworkconditions"}),"PredefinedNetworkConditions"),"."))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.emulatetimezone"}),"emulateTimezone(timezoneId)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.emulatevisiondeficiency"}),"emulateVisionDeficiency(type)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Simulates the given vision deficiency on the page.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.evaluate"}),"evaluate(pageFunction, args)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("p",null,"Evaluates a function in the page's context and returns the result."),(0,n.kt)("p",null,"If the function passed to ",(0,n.kt)("code",null,"page.evaluate")," returns a Promise, the function will wait for the promise to resolve and return its value."))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.evaluatehandle"}),"evaluateHandle(pageFunction, args)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.evaluateonnewdocument"}),"evaluateOnNewDocument(pageFunction, args)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("p",null,"Adds a function which would be invoked in one of the following scenarios:"),(0,n.kt)("p",null,"- whenever the page is navigated"),(0,n.kt)("p",null,"- whenever the child frame is attached or navigated. In this case, the function is invoked in the context of the newly attached frame."),(0,n.kt)("p",null,"The function is invoked after the document was created but before any of its scripts were run. This is useful to amend the JavaScript environment, e.g. to seed ",(0,n.kt)("code",null,"Math.random"),"."))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.exposefunction"}),"exposeFunction(name, pptrFunction)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("p",null,"The method adds a function called ",(0,n.kt)("code",null,"name")," on the page's ",(0,n.kt)("code",null,"window")," object. When called, the function executes ",(0,n.kt)("code",null,"puppeteerFunction")," in node.js and returns a ",(0,n.kt)("code",null,"Promise")," which resolves to the return value of ",(0,n.kt)("code",null,"puppeteerFunction"),"."),(0,n.kt)("p",null,"If the puppeteerFunction returns a ",(0,n.kt)("code",null,"Promise"),", it will be awaited."),(0,n.kt)("p",null,":::note"),(0,n.kt)("p",null,"Functions installed via ",(0,n.kt)("code",null,"page.exposeFunction")," survive navigations."),(0,n.kt)("p",null,":::note"))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.focus"}),"focus(selector)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"This method fetches an element with ",(0,n.kt)("code",null,"selector")," and focuses it. 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See ",(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.locator"}),"Locator")," for details and supported actions.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.mainframe"}),"mainFrame()")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"The page's main frame.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.metrics"}),"metrics()")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Object containing metrics as key/value pairs.")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.off"}),"off(eventName, handler)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}))),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("a",r({parentName:"td"},{href:"/api/puppeteer.page.on"}),"on(eventName, handler)")),(0,n.kt)("td",r({parentName:"tr"},{align:null})),(0,n.kt)("td",r({parentName:"tr"},{align:null}),(0,n.kt)("p",null,"Listen to page events."),(0,n.kt)("p",null,":::note"),(0,n.kt)("p",null,"This method exists to define event typings and handle proper wireup of cooperative request interception. 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