overlay
A property used for elements in the 'top layer' (like <dialog> or popovers). It specifies whether an element should be rendered in the top layer even when it's not the active modal.
It is documented as part of the CSS Positioned Layout specification. This is an experimental technology. The syntax and behavior are still subject to change.
Syntax
/* Usage Example */
.active-popover {
/* Ensures the popover stays in the top layer during transitions */
overlay: auto;
transition: overlay 0.5s allow-discrete;
}
/* Syntax */
overlay: none;
overlay: auto;
/* Global values */
overlay: inherit;
overlay: initial;
overlay: revert;
overlay: revert-layer;
overlay: unset;overlay Browser support
This feature is not Baseline because it does not work in some of the most widely-used browsers.
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