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href="/puppeteer/api/puppeteer.page.setrequestinterception">setrequestinterception</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.page.setuseragent">setuseragent</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.page.setviewport">setviewport</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.page.tap">tap</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.page.target">target</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" 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href="/puppeteer/api/puppeteer.page.waitfornetworkidle">waitfornetworkidle</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.page.waitforrequest">waitforrequest</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.page.waitforresponse">waitforresponse</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.page.waitforselector">waitforselector</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.page.waitforselector_1">waitforselector_1</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a 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href="/puppeteer/api/puppeteer.pageeventobject">pageeventobject</a><button aria-label="Toggle the collapsible sidebar category 'pageeventobject'" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/puppeteer/api/puppeteer.paperformat">paperformat</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/puppeteer/api/puppeteer.pdfmargin">pdfmargin</a><button aria-label="Toggle the collapsible sidebar category 'pdfmargin'" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div 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menu__caret"></button></div></li></ul></li></ul></nav></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_GujU"><div class="docItemContainer_Adtb"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/puppeteer/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_OVgt"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/puppeteer/api/"><span itemprop="name">API</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/puppeteer/api/puppeteer.page"><span itemprop="name">page</span></a><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">once</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_aoJ5"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Page.once() method</h1><p><strong>Signature:</strong></p><div class="language-typescript codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-typescript codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token generic-function function" style="color:#d73a49">once</span><span class="token generic-function generic class-name operator" style="color:#393A34"><</span><span class="token generic-function generic class-name constant" style="color:#36acaa">K</span><span class="token generic-function generic class-name"> </span><span class="token generic-function generic class-name keyword" style="color:#00009f">extends</span><span class="token generic-function generic class-name"> </span><span class="token generic-function generic class-name keyword" style="color:#00009f">keyof</span><span class="token generic-function generic class-name"> PageEventObject</span><span class="token generic-function generic class-name operator" style="color:#393A34">></span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">eventName</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token constant" style="color:#36acaa">K</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token function-variable function" style="color:#d73a49">handler</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">event</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> PageEventObject</span><span class="token punctuation" style="color:#393A34">[</span><span class="token constant" style="color:#36acaa">K</span><span class="token punctuation" style="color:#393A34">]</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">=></span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">void</span><span class="token punctuation" style="color:#393A34">)</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> EventEmitter</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="parameters">Parameters<a class="hash-link" href="#parameters" title="Direct link to heading"></a></h2><table><thead><tr><th>Parameter</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>eventName</td><td>K</td><td></td></tr><tr><td>handler</td><td>(event: <a href="/puppeteer/api/puppeteer.pageeventobject">PageEventObject</a>[<!-- -->K<!-- -->]<!-- -->) =<!-- -->><!-- --> void</td><td></td></tr></tbody></table><p><strong>Returns:</strong></p><p><a href="/puppeteer/api/puppeteer.eventemitter">EventEmitter</a></p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/puppeteer/api/puppeteer.page.on"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Page.on() method</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/puppeteer/api/puppeteer.page.pdf"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Page.pdf() method</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#parameters" class="table-of-contents__link toc-highlight">Parameters</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://stackoverflow.com/questions/tagged/puppeteer" target="_blank" rel="noopener noreferrer" class="footer__link-item">Stack Overflow<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_lCJq"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 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