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<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>PNG Third Edition: animated PNG, dispose ops</title>
<link rel="author" title="Philip Taylor" href="mailto:excors@gmail.com">
<link rel="author" title="Chris Lilley" href="mailto:chris@w3.org">
<link rel="help" href="https://www.w3.org/TR/png-3/#apng-frame-based-animation">
<link rel="help" href="https://www.w3.org/TR/png-3/#fcTL-chunk">
<link rel="match" href="apng-checkerboard-ref.html">
<meta name="assert" content="If the first fcTL chunk uses a dispose_op of APNG_DISPOSE_OP_PREVIOUS it should be treated as APNG_DISPOSE_OP_BACKGROUND.">
<script>
const el = document.querySelector(".reftest-wait");
setTimeout(() => {
el.classList.remove('reftest-wait');
}, 1200);
</script>
<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 a grey checkerboard, and no red.</p>
<div class="test"><img src="support/012.png" alt=""></div>
</body>
</html>
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