<!
DOCTYPE html>
<
html class=
"reftest-wait">
<
meta charset=
"utf-8">
<
title>PNG Third Edition: animated PNG, bit depth. 8bit grayscale</
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/#fdAT-chunk">
<
link rel=
"match" href=
"apng-graywhite-rectangle-ref.html">
<
meta name=
"assert" content=
"It utilizes the same bit depth, colour type, compression method, filter method, interlace method, and palette (if any) as the static image.">
<
script>
const el = document.querySelector(
".reftest-wait");
setTimeout(() => {
el.classList.remove(
'reftest-wait');
}, 2100);
</
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 gray rectangle, with a white rectangle in the middle, and no red.</p>
<
div class=
"test"><
img src=
"support/034.png" alt=
""></
div>
</
body>
