<!DOCTYPE html> <html lang="en-US"> <head> <title>test of border-image-source: linear-gradient with border-image-outset</title> <style> div { border: 30px solid black; width: 90px; height: 90px; margin: 90px; } div.border { border-image: linear-gradient(to bottom right, red, blue); border-image-outset: 0.5 1 2 60px; } div.border30 { border-image: linear-gradient(to bottom right, red, blue); border-image-outset: 0.5 1 2 60px; border-image-slice: 30 30; } div.border1260 { border-image: linear-gradient(to bottom right, red, blue); border-image-outset: 0.5 1 2 60px; border-image-slice: 12 60; } </style> </head> <body> <div class="border"></div> <div class="border30"></div> <div class="border1260"></div> </body> </html>