1 files changed, 49 insertions, 0 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_highlight-element-rule.js b/devtools/client/inspector/rules/test/browser_rules_highlight-element-rule.js
new file mode 100644
index 0000000000..f5e1357950
--- /dev/null
+++ b/devtools/client/inspector/rules/test/browser_rules_highlight-element-rule.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that the rule view's highlightElementRule scrolls to the specified rule.
+
+const TEST_URI = `
+  <style type="text/css">
+    .test::after {
+      content: "!";
+      color: red;
+    }
+  </style>
+  <div class="test">Hello</div>
+`;
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
+  const { inspector, view } = await openRuleView();
+
+  await selectNode(".test", inspector);
+  const { rules, styleWindow } = view;
+
+  info("Highlight .test::after rule.");
+  const ruleId = rules[0].domRule.actorID;
+
+  info("Wait for the view to scroll to the property.");
+  const onHighlightProperty = view.once("scrolled-to-element");
+
+  view.highlightElementRule(ruleId);
+
+  await onHighlightProperty;
+
+  ok(
+    isInViewport(rules[0].editor.element, styleWindow),
+    ".test::after is in view."
+  );
+});
+
+function isInViewport(element, win) {
+  const { top, left, bottom, right } = element.getBoundingClientRect();
+  return (
+    top >= 0 &&
+    bottom <= win.innerHeight &&
+    left >= 0 &&
+    right <= win.innerWidth
+  );
+}