Concave rounded shape (real transparency, no covers) on
@codepen https://codepen.io/thebabydino/pen/KwMPrMM
`clip-path`/ `mask` on the image have no idea about the dimensions of corner elems. We need another way to create the shape taking into account how those elements are resized by text reflow.
No magic numbers and no media/ container queries. Instead, we use #subgrid to add the cutout areas to a frame and on #SVG filters to round the shaped frame & to extract just the shaped image.