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Baseline Layered UI Patterns: <dialog> and popover

Elements and windows that pop up on the screen are one of the most common patterns on the web. With use cases spanning from alerts and brief forms requesting data, to the now ubiquitous cookie settings prompt, these layered UI patterns are used frequently by developers.

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Most of these user interface elements are added to web applications using either custom JavaScript or common libraries. With that route there’s a lot to make sure that you or the library you choose gets right.

The <dialog> element and the popover attribute are two Baseline layered UI patterns that developers can reach for instead of custom implementations. To show the advantages of using layered UI patterns built into today’s web browsers – and to give an example of when you might reach for <dialog> or use the popover attribute – this article walks through an example of a modal that appears when the user attempts to save an image to a favorites list without being logged in.

See the Pen Baseline dialog demo by @web-dot-dev on CodePen.

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