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diff --git a/testing/web-platform/tests/css/css-env/unknown-env-names-override-previous.tentative.html b/testing/web-platform/tests/css/css-env/unknown-env-names-override-previous.tentative.html
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+++ b/testing/web-platform/tests/css/css-env/unknown-env-names-override-previous.tentative.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+ <head>
+ <link rel="help" href="https://drafts.csswg.org/css-env-1/">
+ <title>Test unknown env() names will override previous values</title>
+ <script src="/resources/testharness.js"></script>
+ <script src="/resources/testharnessreport.js"></script>
+ </head>
+ <body style="background-color: green; background-color: env(unknown);">
+ <script>
+ test(() => {
+ const style = window.getComputedStyle(document.body);
+ assert_equals(style.getPropertyValue("background-color"), "rgba(0, 0, 0, 0)");
+ });
+ </script>
+ </body>
+</html>