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+<!doctype html>
+<title>CSS Test: @font-face should not leak out of shadow tree.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="author" title="Alan Stearns" href="mailto:stearns@adobe.com">
+<link rel="help" href="https://drafts.csswg.org/css-scoping/#shadow-names">
+
+<style>
+ #in-document {
+ font-family: ff-16-wide;
+ }
+</style>
+<div id="host"><span id="in-document">1234567890</span></div>
+<script>
+test(function() {
+ host.attachShadow({ mode: "open" }).innerHTML = `
+ <style>
+ @font-face {
+ font-family: ff-16-wide;
+ src: url(/fonts/Ahem.ttf);
+ }
+ #in-shadow {
+ font-family: ff-16-wide;
+ }
+ </style>
+ <slot></slot>
+ <span id="in-shadow">0123456789</span>
+ `;
+
+ assert_not_equals(document.getElementById('in-document').offsetWidth, 160);
+ assert_equals(host.shadowRoot.getElementById('in-shadow').offsetWidth, 160);
+}, "@font-face should not leak out of shadow tree.");
+</script>