<!DOCTYPE html> <!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <html> <head> <title>CSS Reference</title> <style> div { border: 1px solid black; width: 50px; height: 40px; margin: 1px; float: left; } br { clear: both; } </style> </head> <body> <!-- Note: -webkit-gradient(radial, ...) expressions involve *two* circles, with the gradient progressing between their edges. But, the standard syntax (& hence our emulation) only supports *one* circle. So, in our reference renderings below, we ignore the smaller circle from the testcase's gradient expression, and we use a gradient that progresses from the outer circle's center to its edge. (Conceptually, we collapse the smaller circle to a point at the center of the larger circle.) --> <!-- Inner circle has nonzero radius, in testcase: (We ignore it here.) --> <div style="background: radial-gradient(circle 40px at left top, blue, yellow)"></div> <div style="background: radial-gradient(circle 50px at center center, yellow, blue)"></div> <br> <!-- Both circles have the same radius, in testcase: (We pretend the first one is 0-sized.) --> <div style="background: radial-gradient(circle 40px at center center, blue, yellow)"></div> <div style="background: radial-gradient(circle 10px at 10px 10px, blue, yellow)"></div> <br> <!-- Inner circle has different center than outer circle, in testcase: (We collapse it to center of outer circle.) --> <div style="background: radial-gradient(circle 40px at left top, blue, yellow)"></div> <div style="background: radial-gradient(circle 40px at 10px 20px, yellow, blue)"></div> <br> <!-- Inner circle and outer circle do not even intersect, in testcase: (We collapse smaller circle to center of larger circle.) --> <div style="background: radial-gradient(circle 10px at 30px 10px, blue, yellow)"></div> <div style="background: radial-gradient(circle 30px at 150px 10px, blue, yellow)"></div> </body> </html>