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-rw-r--r--layout/style/test/test_font_face_cascade.html35
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diff --git a/layout/style/test/test_font_face_cascade.html b/layout/style/test/test_font_face_cascade.html
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+++ b/layout/style/test/test_font_face_cascade.html
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+<!DOCTYPE HTML>
+<title>Test that @font-face rules from different origins cascade correctly</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
+<script>
+let io = SpecialPowers.Cc["@mozilla.org/network/io-service;1"]
+ .getService(SpecialPowers.Ci.nsIIOService);
+
+let utils = SpecialPowers.getDOMWindowUtils(window);
+
+function load_sheet(sheet_text, level) {
+ if (level != "AGENT_SHEET" && level != "USER_SHEET" && level != "AUTHOR_SHEET") {
+ throw "unknown level";
+ }
+
+ let uri = io.newURI("data:text/css," + encodeURI(sheet_text));
+ utils.loadSheet(uri, utils[level]);
+}
+
+load_sheet(
+ "@font-face { font-family: TestAgent; src: url(about:invalid); }",
+ "AGENT_SHEET");
+
+load_sheet(
+ "@font-face { font-family: TestAuthor; src: url(about:invalid); }",
+ "AUTHOR_SHEET");
+
+load_sheet(
+ "@font-face { font-family: TestUser; src: url(about:invalid); }",
+ "USER_SHEET");
+
+is([...document.fonts].map(f => f.family).join(" "),
+ 'TestAgent TestUser TestAuthor',
+ "@font-face rules are returned in correct cascade order");
+</script>