1 files changed, 46 insertions, 0 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_grid-highlighter-on-mutation.js b/devtools/client/inspector/rules/test/browser_rules_grid-highlighter-on-mutation.js
new file mode 100644
index 0000000000..1394c0532c
--- /dev/null
+++ b/devtools/client/inspector/rules/test/browser_rules_grid-highlighter-on-mutation.js
@@ -0,0 +1,46 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that the grid highlighter is hidden when the highlighted grid container is
+// removed from the page.
+
+const TEST_URI = `
+  <style type='text/css'>
+    #grid {
+      display: grid;
+    }
+  </style>
+  <div id="grid">
+    <div id="cell1">cell1</div>
+    <div id="cell2">cell2</div>
+  </div>
+`;
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
+  const { inspector, view } = await openRuleView();
+  const highlighters = inspector.highlighters;
+  const HIGHLIGHTER_TYPE = inspector.highlighters.TYPES.GRID;
+  const { waitForHighlighterTypeShown, waitForHighlighterTypeHidden } =
+    getHighlighterTestHelpers(inspector);
+
+  await selectNode("#grid", inspector);
+  const container = getRuleViewProperty(view, "#grid", "display").valueSpan;
+  const gridToggle = container.querySelector(".js-toggle-grid-highlighter");
+
+  info("Toggling ON the CSS grid highlighter from the rule-view.");
+  const onHighlighterShown = waitForHighlighterTypeShown(HIGHLIGHTER_TYPE);
+  gridToggle.click();
+  await onHighlighterShown;
+  is(highlighters.gridHighlighters.size, 1, "CSS grid highlighter is shown.");
+
+  const onHighlighterHidden = waitForHighlighterTypeHidden(HIGHLIGHTER_TYPE);
+  info("Remove the #grid container in the content page");
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () =>
+    content.document.querySelector("#grid").remove()
+  );
+  await onHighlighterHidden;
+  ok(!highlighters.gridHighlighters.size, "CSS grid highlighter is hidden.");
+});