1 files changed, 57 insertions, 0 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_mark_overridden_01.js b/devtools/client/inspector/rules/test/browser_rules_mark_overridden_01.js
new file mode 100644
index 0000000000..4ac9ea3498
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+++ b/devtools/client/inspector/rules/test/browser_rules_mark_overridden_01.js
@@ -0,0 +1,57 @@
+/* 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 based on the
+// specificity of the rule.
+
+const TEST_URI = `
+  <style type='text/css'>
+  #testid {
+    background-color: blue;
+  }
+  .testclass {
+    background-color: green;
+  }
+  </style>
+  <div id='testid' class='testclass'>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);
+
+  const idProp = getTextProperty(view, 1, { "background-color": "blue" });
+  ok(!idProp.overridden, "ID prop should not be overridden.");
+  ok(
+    !idProp.editor.element.classList.contains("ruleview-overridden"),
+    "ID property editor should not have ruleview-overridden class"
+  );
+
+  const classProp = getTextProperty(view, 2, { "background-color": "green" });
+  ok(classProp.overridden, "Class property should be overridden.");
+  ok(
+    classProp.editor.element.classList.contains("ruleview-overridden"),
+    "Class property editor should have ruleview-overridden class"
+  );
+
+  // Override background-color by changing the element style.
+  const elementProp = await addProperty(view, 0, "background-color", "purple");
+
+  ok(
+    !elementProp.overridden,
+    "Element style property should not be overridden"
+  );
+  ok(idProp.overridden, "ID property should be overridden");
+  ok(
+    idProp.editor.element.classList.contains("ruleview-overridden"),
+    "ID property editor should have ruleview-overridden class"
+  );
+  ok(classProp.overridden, "Class property should be overridden");
+  ok(
+    classProp.editor.element.classList.contains("ruleview-overridden"),
+    "Class property editor should have ruleview-overridden class"
+  );
+});