CSS Masking: Basic shape inset() on SVG rectangle with percentag values
svg
A basic shape function inset() applied to an SVG
rectangle. Percentage values are relative to a reference box. If not
reference box was specified the objectBoundingBox is used. The inset used
per side is specified by the first 10% argument. The second 10% specify the
border radius. You should see a green square with rounded corners.