<!DOCTYPE html> <html lang="en-US"> <head> <title>test of border-image-source: linear-gradient with border-image-slice</title> <style> div { border: 30px solid black; border-image: linear-gradient(to bottom right, red, blue); width: 180px; height: 180px; } div.border12 { border-image-slice: 12 12; } div.border30 { border-image-slice: 30 30; } div.border60 { border-image-slice: 60 60; } </style> </head> <body> <div class="border12"></div> <div class="border30"></div> <div class="border60"></div> </body> </html>