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+<!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>