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diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-opsz.html b/testing/web-platform/tests/css/css-fonts/variations/variable-opsz.html
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+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-opsz.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="author" title="Dominik Röttsches" href="drott@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-optical-sizing-def"/>
+<meta name="assert" content="Ensures that optical size is automatically applied."/>
+<link rel="match" href="variable-opsz-ref.html">
+<meta charset="utf-8">
+<style>
+ @font-face {
+ font-family: variabletest_box;
+ src: url(resources/variabletest_box.ttf);
+ }
+
+ body {
+ font-family: variabletest_box, sans-serif;
+ }
+</style>
+<!-- The variabletest_box font file contains a glyph for letter B which moves a
+ horizontal bar up from the middle for opsz > 12 and moves it down for opsz >
+ 12 where the opsz axis ranges from 12 to 128. -->
+<div style="font-size: 6px;">B</div>
+<div style="font-size: 12px;">B</div>
+<div style="font-size: 24px;">B</div>
+<div style="font-size: 48px;">B</div>
+<div style="font-size: 64px;">B</div>
+<div style="font-size: 128px;">B</div>
+<!-- Explicit value overrides auto. -->
+<div style="font-size: 24px; font-variation-settings: 'opsz' 128;">B</div>
+<div style="font-size: 48px; font-optical-sizing: none;">B</div>
+<script>
+ document.fonts.ready.then(
+ () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>