File: devicepixel2-ref.html

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<!doctype html>
<body>
<script type="module">
import createPatternDataURL from './create-pattern-data-url.js';

const { patternSize, dataURL } = createPatternDataURL();
document.body.style.backgroundImage = `url("${dataURL}")`;

function setBackgroundPatternTo1DevicePixel() {
  const oneDevicePixel = 1 / devicePixelRatio;
  const patternPixels = oneDevicePixel * patternSize;
  document.body.style.backgroundSize = `${patternPixels}px ${patternPixels}px`;
}
setBackgroundPatternTo1DevicePixel();

// If we're viewed interactively and the user activates
// full-page-zoom, changes the page zoom level, or resizes
// the window, update the rendering to account for that:
window.addEventListener('resize', setBackgroundPatternTo1DevicePixel);
</script>
</body>