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diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-gsub.html b/testing/web-platform/tests/css/css-fonts/variations/variable-gsub.html
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+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-gsub.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="match" href="variable-gsub-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;
+ sans-serif;
+ font-size: 100px;
+ }
+
+ .rvrn_replaced {
+ font-variation-settings: "FVTT" 10;
+ }
+</style>
+<!-- The variabletest_box font has an r glyph that says "rvrn base" and has
+ this as a name as well. And it has a glyph for R that says "rvrn subst"
+ where rvrn stands for the required Required Variation Alternates
+ feature. The font has an 'FVTT' axis ranging from 0 to 10, where it uses
+ a single substitution glyph lookup table for axis values starting from
+ 5, which then replaces the rvrn_base glyph with the rvrn_subst
+ glyph. So in this reftest the substituted glyph for lowercase r
+ should visually match the uppercase R glyph, both show "rvrn subst". -->
+r <span class="rvrn_replaced">r</span>
+<script>
+ document.fonts.ready.then(
+ () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>