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diff --git a/testing/web-platform/tests/css/css-scoping/host-parsing.html b/testing/web-platform/tests/css/css-scoping/host-parsing.html
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+++ b/testing/web-platform/tests/css/css-scoping/host-parsing.html
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+<!DOCTYPE html>
+<title>Test parsing of the :host/host() pseudo-classes</title>
+<link rel="help" href="https://drafts.csswg.org/css-scoping/#selectordef-host-function">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<script>
+ test_valid_selector(':host');
+ test_valid_selector(':host(.a)');
+ test_valid_selector(':host(div.a)');
+
+ test_invalid_selector(':host()');
+ test_invalid_selector(':host(.a, .b)');
+ test_invalid_selector(':host(.a + .b)');
+ test_invalid_selector(':host(.a + .b, #c > #d)');
+</script>