Bug 1523562 [wpt PR 15058] - @charset isn't a valid rule and should be dropped, a=testonly

Automatic update from web-platform-tests @charset isn't a valid rule and should be dropped -- Spaces, not tabs :( -- Merge pull request #15058 from web-platform-tests/tabatkins-patch-2 @charset isn't a valid rule and should be dropped -- wpt-commits: 77561fc06acd05384ce8c70479d8bcb10325b81b, b483a4f829a044371555c5a7b90e57c53a66a804, 388ba3a049a3473b1945b9f8f81e9d6e342a249e wpt-pr: 15058
2019-02-01 11:39:16 +00:00 · 2019-02-01 11:39:16 +00:00 · 160cc7df98
--- a/testing/web-platform/tests/css/css-syntax/charset-is-not-a-rule.html
+++ b/testing/web-platform/tests/css/css-syntax/charset-is-not-a-rule.html
@ -0,0 +1,17 @@
+<!doctype html>
+<title>@charset isn't a valid rule and should be dropped</title>
+<meta name="author" title="Tab Atkins-Bittner">
+<link rel=help href="https://drafts.csswg.org/css-syntax/#charset-rule">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+@charset "utf-8";
+@charset "utf-8";
+foo { color: blue; }
+@charset "utf-8";
+</style>
+<script>
+test(()=>{
+    assert_true(document.styleSheets[0].cssRules.length == 1)
+}, "@charset isn't a valid rule and shouldn't show up in the OM");
+</script>