WPT details: This is part of Interop 2023 and is covered by tests under "wpt/css/css-masking": https://wpt.fyi/results/css/css-masking?label=experimental&label=master&product=chrome&product=firefox&product=safari&aligned&view=interop&q=label%3Ainterop-2023-cssmasking
Clip-path supports <geometry-box> values to control the clip's reference box, making clip-path easier to use. These box values can be used alongside basic shapes (for example, clip-path: circle(50%) margin-box), or they can be used alone to clip to the specified box (for example, clip-path: content-box).