A First Look at the Interest Invoker API (for Hover-Triggered Popovers)
July 25, 2025
Chrome 139 is experimenting with Open UI’s proposed Interest Invoker API, which would be used to create tooltips, hover menus, hover cards, quick actions, and other types of UIs for showing more information with hover interactions. The Interest Invoker API makes these components declarative and hover-triggered, meaning that you create them with HTML, and then the web browser handles the mouseenter and mouseleave events for you, sans JavaScript.
Source: A First Look at the Interest Invoker API (for Hover-Triggered Popovers) | CSS-Tricks
While we typically don’t cover web technologies until they are baseline newly available, some features we think are sufficient impactful (or perhaps can be used well with polyfills) that we cover them earlier.
Invokers are one such technology–a declarative way in HTML alone to specify behaviours that would have previously required JavaScript.
Interest Invokers are currently in Chrome 139 and provide a way to declarative create tooltips, hover menus and other ‘floating’ type elements.
