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+++ b/testing/web-platform/tests/css/css-fonts/font-synthesis-weight.html
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+<!DOCTYPE html>
+<html lang="en">
+<meta charset="utf-8">
+<title>CSS Test: font-synthesis-weight: none disables fake bold</title>
+<link rel="match" href="font-synthesis-weight-ref.html">
+<link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-synthesis-weight">
+<meta name="assert" content=" If ‘weight’ is not specified, user agents must not synthesize bold faces">
+<style>
+    @font-face {
+        font-family: "lato";
+        src: url(support/fonts/Lato-Medium.ttf);
+    }
+    @supports not (font-synthesis-weight: none) {
+        .test {color: red;}
+    }
+    .test {
+        font-family: "lato";
+        font-size: 3em;
+    }
+    .nosynth {
+        font-weight: bold;
+        font-synthesis-weight: none;
+    }
+</style>
+
+<p>Test passes if the two lines below are identical (the second line is <em>not bold</em>), and there is no red.</p>
+<section class="test">
+    <p>Filler text</p>
+    <p class="nosynth">Filler text</p>
+</section>