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diff --git a/testing/web-platform/tests/css/compositing/background-blending/background-blend-mode-plus-lighter.html b/testing/web-platform/tests/css/compositing/background-blending/background-blend-mode-plus-lighter.html
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+++ b/testing/web-platform/tests/css/compositing/background-blending/background-blend-mode-plus-lighter.html
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+<!DOCTYPE html>
+<title>background-blend-mode: plus-lighter test</title>
+<link rel="author" title="Jake Archibald" href="mailto:jakearchibald@chromium.org">
+<link rel="help" href="https://drafts.fxtf.org/compositing-2/#background-blend-mode">
+<link rel="match" href="reference/background-blend-mode-plus-lighter-ref.html">
+<meta name="fuzzy" content="maxDifference=0-1;totalPixels=0-4294967295">
+<style>
+ .test {
+ width: 100px;
+ height: 100px;
+ background-blend-mode: plus-lighter;
+ }
+</style>
+<script type="module">
+ import { tests } from '../support/plus-lighter.js';
+ import { toCSSColor } from '../support/utils.js';
+
+ // Create a solid color CSS image.
+ const colorImage = (pixel) =>
+ `linear-gradient(to right, ${toCSSColor(pixel)}, ${toCSSColor(pixel)})`;
+
+ const createBackgrounds = (colors) => colors
+ // Backgrounds are top first
+ .slice().reverse()
+ .map((color) => colorImage(color))
+ .join(', ');
+
+ for (const colors of tests) {
+ document.body.insertAdjacentHTML('beforeend', `
+ <div class="test" style="background-image: ${createBackgrounds(colors)}"></div>
+ `);
+ }
+</script>