Align with Gecko and spec on grouping properties

Category: Miscellaneous
Type: No developer-visible change
Status: Enabled by default (Chrome 88)
Intent stage: Shipped

Summary

The CSS transforms level 2 spec requires that any grouping property causes the used value of transform-style to be flat. Chromium applies grouping for some of the specified grouping properties, but not all. This change tracked here will add: * clip * clip-path * mask * backdrop-filter * isolation

Motivation

Align with the spec

Standards & signals

Specification: https://drafts.csswg.org/css-transforms-2/#grouping-property-values
Firefox: Shipped/Shipping
Safari: No signal
Web developers: No signals
Tracking bug: https://crbug.com/1008483

Explainers: N/A

View on chromestatus.com