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diff --git a/devtools/client/inspector/grids/test/browser_grids_grid-list-subgrids_01.js b/devtools/client/inspector/grids/test/browser_grids_grid-list-subgrids_01.js
new file mode 100644
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+++ b/devtools/client/inspector/grids/test/browser_grids_grid-list-subgrids_01.js
@@ -0,0 +1,138 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that the list of grids show the subgrids in the correct nested list and toggling
+// the CSS grid highlighter for a subgrid.
+
+const TEST_URI = URL_ROOT + "doc_subgrid.html";
+
+add_task(async function () {
+  await addTab(TEST_URI);
+  const { gridInspector, inspector } = await openLayoutView();
+  const { document: doc } = gridInspector;
+  const { highlighters, store } = inspector;
+
+  await selectNode(".container", inspector);
+  const gridListEl = doc.getElementById("grid-list");
+  const containerSubgridListEl = gridListEl.children[1];
+  const mainSubgridListEl = containerSubgridListEl.querySelector("ul");
+
+  info("Checking the initial state of the Grid Inspector.");
+  is(
+    getGridItemElements(gridListEl).length,
+    1,
+    "One grid container is listed."
+  );
+  is(
+    getGridItemElements(containerSubgridListEl).length,
+    2,
+    "Got the correct number of subgrids in div.container"
+  );
+  is(
+    getGridItemElements(mainSubgridListEl).length,
+    2,
+    "Got the correct number of subgrids in main.subgrid"
+  );
+  ok(
+    !highlighters.gridHighlighters.size &&
+      !highlighters.parentGridHighlighters.size,
+    "No CSS grid highlighter is shown."
+  );
+
+  info("Toggling ON the CSS grid highlighter for header.");
+  let onHighlighterShown = highlighters.once("grid-highlighter-shown");
+  let onCheckboxChange = waitUntilState(
+    store,
+    state => state.grids[1].highlighted
+  );
+  let checkbox = containerSubgridListEl.children[0].querySelector("input");
+  checkbox.click();
+  await onHighlighterShown;
+  await onCheckboxChange;
+
+  info(
+    "Checking the CSS grid highlighter and parent grid highlighter are created."
+  );
+  is(highlighters.gridHighlighters.size, 1, "CSS grid highlighter is shown.");
+  is(
+    highlighters.parentGridHighlighters.size,
+    1,
+    "CSS grid highlighter for parent grid container is shown."
+  );
+
+  info("Toggling ON the CSS grid highlighter for main.");
+  onHighlighterShown = highlighters.once("grid-highlighter-shown");
+  onCheckboxChange = waitUntilState(
+    store,
+    state => state.grids[1].highlighted && state.grids[2].highlighted
+  );
+  checkbox = containerSubgridListEl.children[1].querySelector("input");
+  checkbox.click();
+  await onHighlighterShown;
+  await onCheckboxChange;
+
+  info("Checking the number of CSS grid highlighters present.");
+  is(
+    highlighters.gridHighlighters.size,
+    2,
+    "Got the correct number of CSS grid highlighter shown."
+  );
+  is(
+    highlighters.parentGridHighlighters.size,
+    1,
+    "Only 1 parent grid highlighter should be shown for the same subgrid parent."
+  );
+
+  info("Toggling OFF the CSS grid highlighter for main.");
+  let onHighlighterHidden = highlighters.once("grid-highlighter-hidden");
+  onCheckboxChange = waitUntilState(
+    store,
+    state => state.grids[1].highlighted && !state.grids[2].highlighted
+  );
+  checkbox.click();
+  await onHighlighterHidden;
+  await onCheckboxChange;
+
+  info("Checking the number of CSS grid highlighters present.");
+  is(
+    highlighters.gridHighlighters.size,
+    1,
+    "Got the correct number of CSS grid highlighter shown."
+  );
+  is(
+    highlighters.parentGridHighlighters.size,
+    1,
+    "Got the correct number of CSS grid parent highlighter shown."
+  );
+
+  info("Toggling OFF the CSS grid highlighter for header.");
+  onHighlighterHidden = highlighters.once("grid-highlighter-hidden");
+  onCheckboxChange = waitUntilState(
+    store,
+    state => !state.grids[1].highlighted
+  );
+  checkbox = containerSubgridListEl.children[0].querySelector("input");
+  checkbox.click();
+  await onHighlighterHidden;
+  await onCheckboxChange;
+
+  info("Checking the CSS grid highlighter is not shown.");
+  ok(
+    !highlighters.gridHighlighters.size &&
+      !highlighters.parentGridHighlighters.size,
+    "No CSS grid highlighter is shown."
+  );
+});
+
+/**
+ * Returns the grid item elements <li> from the grid list element <ul>.
+ *
+ * @param  {Element} gridListEl
+ *         The grid list element <ul>.
+ * @return {Array<Element>} containing the grid item elements <li>.
+ */
+function getGridItemElements(gridListEl) {
+  return [...gridListEl.children].filter(node => node.nodeName === "li");
+}