1 files changed, 42 insertions, 0 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_computed-lists_03.js b/devtools/client/inspector/rules/test/browser_rules_computed-lists_03.js
new file mode 100644
index 0000000000..f002a77c8b
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+++ b/devtools/client/inspector/rules/test/browser_rules_computed-lists_03.js
@@ -0,0 +1,42 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that the rule view does not show expanders for property values that contain
+// variables.
+// This should, in theory, be able to work, but the complexity outlined in
+// https://bugzilla.mozilla.org/show_bug.cgi?id=1535315#c2 made us hide the expander
+// instead. Also, this is what Chrome does too.
+
+var TEST_URI = `
+  <style type="text/css">
+    #testid {
+      --primary-color: black;
+      background: var(--primary-color, red);
+    }
+  </style>
+  <h1 id="testid">Styled Node</h1>
+`;
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
+
+  const { inspector, view } = await openRuleView();
+  await selectNode("#testid", inspector);
+  const rule = getRuleViewRuleEditor(view, 1).rule;
+
+  is(
+    rule.textProps[0].name,
+    "--primary-color",
+    "The first property is the variable"
+  );
+  is(rule.textProps[1].name, "background", "The second property is background");
+
+  info("Check that the expander is hidden for the background property");
+  is(
+    rule.textProps[1].editor.expander.style.display,
+    "none",
+    "Expander is hidden"
+  );
+});