Request for Mozilla Position on an Emerging Web Specification

• Specification Title: The overlay CSS property
• Specification or proposal URL (if available): https://drafts.csswg.org/css-position-4/#overlay
• Explainer URL (if available): https://github.com/chrishtr/rendering/blob/master/entry-exit-animations.md
• Caniuse.com URL (optional):
• Bugzilla URL (optional):
• Mozillians who can provide input (optional):

Other information

The CSS Spec is done. There are additional tie-ins to HTML and fullscreen:

• Remove top layer definitions, now that CSS Position 4 contains them. whatwg/fullscreen#223
• Use CSS spec for top layer whatwg/html#9093

Here is the CSSWG issue: w3c/csswg-drafts#8189