Web platform features explorer

The overlay CSS property, used as an allow-discrete CSS transition, prevents a top layer element, such as a popover or a <dialog>, from being removed from the top layer before it has finished animating. You can't set the value of the overlay property; only use it as transition property.

Status

Limited availability

MDN documentation

overlay

Specifications

CSS Positioned Layout Module Level 4 (#overlay), from Cascading Style Sheets (CSS) Working Group (W3C).

Browser support

Chrome 117 Released on 2023-09-12
Chrome Android 117 Released on 2023-09-12
Edge 117 Released on 2023-09-15
Firefox ❌ See bugzil.la/1841456 Vendor position : unknown
Firefox for Android ❌ See bugzil.la/1841456 Vendor position : unknown
Safari ❌ Vendor position : unknown
Safari on iOS ❌ Vendor position : unknown

Usage (according to Chrome Platform Status)

~0.042% of page loads. More data at chromestatus.com.

Web Platform Tests (WPT)

View the latest WPT test results for this feature

Developer signals

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