1 files changed, 94 insertions, 0 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_highlight-property.js b/devtools/client/inspector/rules/test/browser_rules_highlight-property.js
new file mode 100644
index 0000000000..6c244cecfd
--- /dev/null
+++ b/devtools/client/inspector/rules/test/browser_rules_highlight-property.js
@@ -0,0 +1,94 @@
+/* Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that the rule view's highlightProperty scrolls to the specified declaration.
+
+const TEST_URI = `
+  <style type="text/css">
+    .test {
+      margin: 5px;
+      font-size: 12px;
+      border: 1px solid blue;
+      margin-top: 20px;
+    }
+
+    .test::after {
+      content: "!";
+      color: red;
+    }
+  </style>
+  <div class="test">Hello this is a test</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 the computed border-left-width declaration in the rule view."
+  );
+  const borderLeftWidthStyle = rules[2].textProps[2].computed.find(
+    ({ name }) => name === "border-left-width"
+  );
+
+  let onHighlightProperty = view.once("scrolled-to-element");
+  let isHighlighted = view.highlightProperty("border-left-width");
+  await onHighlightProperty;
+
+  ok(isHighlighted, "border-left-property is highlighted.");
+  ok(
+    isInViewport(borderLeftWidthStyle.element, styleWindow),
+    "border-left-width is in view."
+  );
+
+  info("Highlight the font-size declaration in the rule view.");
+  const fontSize = rules[2].textProps[1].editor;
+
+  info("Wait for the view to scroll to the property.");
+  onHighlightProperty = view.once("scrolled-to-element");
+  isHighlighted = view.highlightProperty("font-size");
+  await onHighlightProperty;
+
+  ok(isHighlighted, "font-size property is highlighted.");
+  ok(isInViewport(fontSize.element, styleWindow), "font-size is in view.");
+
+  info("Highlight the pseudo-element's color declaration in the rule view.");
+  const color = rules[0].textProps[1].editor;
+
+  info("Wait for the view to scroll to the property.");
+  onHighlightProperty = view.once("scrolled-to-element");
+  isHighlighted = view.highlightProperty("color");
+  await onHighlightProperty;
+
+  ok(isHighlighted, "color property is highlighted.");
+  ok(isInViewport(color.element, styleWindow), "color property is in view.");
+
+  info("Highlight margin-top declaration in the rules view.");
+  const marginTop = rules[2].textProps[3].editor;
+
+  info("Wait for the view to scroll to the property.");
+  onHighlightProperty = view.once("scrolled-to-element");
+  isHighlighted = view.highlightProperty("margin-top");
+  await onHighlightProperty;
+
+  ok(isHighlighted, "margin-top property is highlighted.");
+  ok(
+    isInViewport(marginTop.element, styleWindow),
+    "margin-top property 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
+  );
+}