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<!DOCTYPE html>
<!--
Any copyright is dedicated to the Public Domain.
-->
<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>