<!doctype html> <html><head><title>Border radius with percent units — reference</title> <style> div { background: green; } .r1 { height: 20px; } .c1 { width: 20px; } .r2 { height: 40px; } .c2 { width: 40px; } .r3 { height: 60px; } .c3 { width: 60px; } .r4 { height: 80px; } .c4 { width: 80px; } .r1.c1 { border-radius: 5px 2px / 5px 2px; } .r1.c2 { border-radius: 10px 4px / 5px 2px; } .r1.c3 { border-radius: 15px 6px / 5px 2px; } .r1.c4 { border-radius: 20px 8px / 5px 2px; } .r2.c1 { border-radius: 5px 2px / 10px 4px; } .r2.c2 { border-radius: 10px 4px / 10px 4px; } .r2.c3 { border-radius: 15px 6px / 10px 4px; } .r2.c4 { border-radius: 20px 8px / 10px 4px; } .r3.c1 { border-radius: 5px 2px / 15px 6px; } .r3.c2 { border-radius: 10px 4px / 15px 6px; } .r3.c3 { border-radius: 15px 6px / 15px 6px; } .r3.c4 { border-radius: 20px 8px / 15px 6px; } .r4.c1 { border-radius: 5px 2px / 20px 8px; } .r4.c2 { border-radius: 10px 4px / 20px 8px; } .r4.c3 { border-radius: 15px 6px / 20px 8px; } .r4.c4 { border-radius: 20px 8px / 20px 8px; } </style> </head><body> <table> <tr> <td><div class="r1 c1"></div></td> <td><div class="r1 c2"></div></td> <td><div class="r1 c3"></div></td> <td><div class="r1 c4"></div></td> </tr> <tr> <td><div class="r2 c1"></div></td> <td><div class="r2 c2"></div></td> <td><div class="r2 c3"></div></td> <td><div class="r2 c4"></div></td> </tr> <tr> <td><div class="r3 c1"></div></td> <td><div class="r3 c2"></div></td> <td><div class="r3 c3"></div></td> <td><div class="r3 c4"></div></td> </tr> <tr> <td><div class="r4 c1"></div></td> <td><div class="r4 c2"></div></td> <td><div class="r4 c3"></div></td> <td><div class="r4 c4"></div></td> </tr> </table> </body></html>