<!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>