` element. | `endOfArticle` | Disabled | Yes | | Clicking, scrolling, or typing after being inactive for at least 30 seconds. | `inactivity` | Disabled | Yes | | Clicking on the browser navigation bar. (Desktop only) | `navBar` | Disabled | Yes | | Hiding and then returning to the page (for example, by switching tabs). | `unhideWindow` | Disabled | Yes | | Clicking a GPT-created **View ad to continue** button. | `continueReading` | Disabled | Yes | > [!IMPORTANT] > **Important:** Default trigger states are [configurable in Google Ad Manager](https://support.google.com/admanager/answer/9840201). If these values have been modified for your Ad Manager account, they may not match the preceding table. Support for additional user actions may be added in the future. Follow the [GPT release notes](https://developers.google.com/publisher-tag/release-notes) for updates. ## Usage notes - **To ensure an optimal user experience, GPT only requests web interstitial ads on pages that properly support the format.** Web interstitials are only supported when GPT is running in the top window. On pages that don't support web interstitials, `defineOutOfPageSlot()` may return null. Be sure to check for this to avoid errors. - **Only request web interstitial ads on pages or environments where you want an interstitial to appear.** Web interstitial ads are eligible to serve to desktop, tablet, and mobile devices. > [!TIP] > **Tip:** For best results, use `` on mobile pages, or avoid setting fixed widths and heights on your document, as that can result in poorly scaled interstitial ads. - **Web interstitial ads generate their own ad slot.** Unlike other ad types, you don't need to define a `

` for web interstitial ads. These ads automatically create and insert their own container into the page when an ad fills. - **Web interstitial ads have a configurable [frequency cap](https://support.google.com/admanager/answer/9840201#frequency).** This prevents the same user from being shown an interstitial more than once per the specified window of time, per subdomain. The default frequency cap is 1 impression per 10 minutes, and the minimum allowed cap is 1 impression per 1 minute. - **Web interstitial ads require access to local storage.** For publishers integrated with the [IAB Transparency and Consent Framework v2.0](https://support.google.com/admanager/answer/9805023), this means that consent for [Purpose 1](https://support.google.com/admanager/answer/9461778#purposes) is required for web interstitial ads to function. - **Some links on a page might be ineligible to show web interstitial ads.** Interstitial ads won't show when a user clicks an ineligible link, for example, links to URLs without HTTP/HTTPS, and links that open in a new window. > [!NOTE] > **Note:** You can prevent specific links from triggering GPT-managed web interstitials by adding a `data-google-interstitial="false"` attribute to the anchor element or any ancestor of the anchor element. - **If using single-request architecture (SRA) on a page with multiple slots, don't call `display()` until static ad slots divs are created.** As explained in [Ad Best Practices](https://developers.google.com/publisher-tag/guides/ad-best-practices#use_single_request_architecture_correctly), the first call to `display()` requests every ad slot defined prior to that point. Although web interstitial slots don't require a predefined `

`, static ad slots do. Calling `display()` before these elements are present on the page can result in lower quality signals, reducing monetization. Because of this, we recommend delaying the initial call until after the static slots are defined. ## Sample implementation [View demo](https://googleads.github.io/google-publisher-tag-samples/display-web-interstitial-ad/js/demo.html) > [!IMPORTANT] > This sample makes use of library features that are not fully supported when running in an iframe. To view a demo of this sample in a new window, click the **View demo** button above. ### JavaScript ## Loading... [Improve this sample](https://github.com/googleads/google-publisher-tag-samples/tree/main/dist/display-web-interstitial-ad/js) [Report an issue](https://github.com/googleads/google-publisher-tag-samples/issues/new?labels=documentation&template=sample-feedback.md&title=Sample+feedback:+display-web-interstitial-ad/js) ### TypeScript ## Loading... [Improve this sample](https://github.com/googleads/google-publisher-tag-samples/tree/main/dist/display-web-interstitial-ad/ts) [Report an issue](https://github.com/googleads/google-publisher-tag-samples/issues/new?labels=documentation&template=sample-feedback.md&title=Sample+feedback:+display-web-interstitial-ad/ts)