Hi mimoymyma, I think that on point 9.3 of this page http://commons.oreilly.com/wiki/index.php/SVG_Essentials/Clipping_and_Masking you can find something more detailed about circle mask and here https://github.com/SRA-SiliconValley/webkit-webcl/blob/master_r144637/LayoutTests/svg/clip-path/clip-path-shape-rounded-rect-1-expected.svg about rounded corners
Hi mimoymyma,
I think that on point 9.3 of this page http://commons.oreilly.com/wiki/index.php/SVG_Essentials/Clipping_and_Masking you can find something more detailed about circle mask and here https://github.com/SRA-SiliconValley/webkit-webcl/blob/master_r144637/LayoutTests/svg/clip-path/clip-path-shape-rounded-rect-1-expected.svg about rounded corners