1 files changed, 51 insertions, 0 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_mark_overridden_08.js b/devtools/client/inspector/rules/test/browser_rules_mark_overridden_08.js
new file mode 100644
index 0000000000..444c87cbd7
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+++ b/devtools/client/inspector/rules/test/browser_rules_mark_overridden_08.js
@@ -0,0 +1,51 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that the rule view marks overridden rules correctly in pseudo-elements when
+// selecting their host node.
+
+const TEST_URI = `
+  <style type='text/css'>
+  #testid::before {
+    content: 'Pseudo-element';
+    color: red;
+    color: green;
+  }
+  #testid {
+    color: blue;
+  }
+  </style>
+  <div id='testid'>Styled Node</div>
+`;
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
+  const { inspector, view } = await openRuleView();
+  await selectNode("#testid", inspector);
+
+  info(
+    "Check the CSS declarations for ::before in the Pseudo-elements accordion."
+  );
+  const pseudoRule = getRuleViewRuleEditor(view, 1, 0).rule;
+  const pseudoProp1 = pseudoRule.textProps[1];
+  const pseudoProp2 = pseudoRule.textProps[2];
+  ok(
+    pseudoProp1.overridden,
+    "First declaration of color in pseudo-element should be overridden."
+  );
+  ok(
+    !pseudoProp2.overridden,
+    "Second declaration of color in pseudo-element should not be overridden."
+  );
+
+  info(
+    "Check that pseudo-element declarations do not override the host's declarations"
+  );
+  const idProp = getTextProperty(view, 4, { color: "blue" });
+  ok(
+    !idProp.overridden,
+    "The single declaration of color in ID selector should not be overridden"
+  );
+});