apng-blue-rect-checkerboard-ref.html

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<!DOCTYPE html>

<html>

<meta charset="utf-8">

<title>PNG Third Edition: animated PNG, dispose ops and regions</title>

<link rel="author" title="Chris Lilley" href="mailto:chris@w3.org">

<style>

    .test {

        width: 128px;

        height: 64px;

        background-color: white;

        background-image:

        linear-gradient(45deg, #ccc 25%, transparent 25%),

        linear-gradient(-45deg, #ccc 25%, transparent 25%),

        linear-gradient(45deg, transparent 75%, #ccc 75%),

        linear-gradient(-45deg, transparent 75%, #ccc 75%);

        background-size: 16px 16px;

        background-position: 0 0, 0 8px, 8px -8px, -8px 0px;

</style>

<body>

    <p>Test passes if you see solid blue rectangle containing a smaller region with a grey checkerboard, and no red.</p>

    <div class="test"><img src="support/blue-with-hole.png" alt=""></div>

</body>

</html>