1 files changed, 24 insertions, 0 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_keyframeLineNumbers.js b/devtools/client/inspector/rules/test/browser_rules_keyframeLineNumbers.js
new file mode 100644
index 0000000000..98b0452a9b
--- /dev/null
+++ b/devtools/client/inspector/rules/test/browser_rules_keyframeLineNumbers.js
@@ -0,0 +1,24 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that editing a rule will update the line numbers of subsequent
+// rules in the rule view.
+
+const TESTCASE_URI = URL_ROOT + "doc_keyframeLineNumbers.html";
+
+add_task(async function () {
+  await addTab(TESTCASE_URI);
+  const { inspector, view } = await openRuleView();
+  await selectNode("#outer", inspector);
+
+  info("Insert a new property, which will affect the line numbers");
+  await addProperty(view, 1, "font-size", "72px");
+
+  await selectNode("#inner", inspector);
+
+  const value = getRuleViewLinkTextByIndex(view, 3);
+  // Note that this is relative to the <style>.
+  is(value.slice(-3), ":27", "rule line number is 27");
+});