1 files changed, 140 insertions, 0 deletions
diff --git a/devtools/client/accessibility/test/browser/browser_accessibility_tabbing_order_highlighter.js b/devtools/client/accessibility/test/browser/browser_accessibility_tabbing_order_highlighter.js
new file mode 100644
index 0000000000..ed872f46e0
--- /dev/null
+++ b/devtools/client/accessibility/test/browser/browser_accessibility_tabbing_order_highlighter.js
@@ -0,0 +1,140 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Check "Show tabbing order" works as expected
+
+const TEST_URI = `https://example.com/document-builder.sjs?html=
+    <button id=top-btn-1>Top level button before iframe</button>
+    <iframe src="https://example.org/document-builder.sjs?html=${encodeURIComponent(`
+      <button id=iframe-org-btn-1>in iframe button 1</button>
+      <button id=iframe-org-btn-2>in iframe button 2</button>
+    `)}"></iframe>
+    <button id=top-btn-2>Top level button after iframe</button>
+    <iframe src="https://example.net/document-builder.sjs?html=${encodeURIComponent(`
+      <button id=iframe-net-btn-1>in iframe button 1</button>
+    `)}"></iframe>`;
+
+add_task(async () => {
+  const { doc, store, tab, toolbox } = await addTestTab(TEST_URI);
+
+  const topLevelFrameHighlighterTestFront = await toolbox.target.getFront(
+    "highlighterTest"
+  );
+
+  const frameTargets = toolbox.commands.targetCommand.getAllTargets([
+    toolbox.commands.targetCommand.TYPES.FRAME,
+  ]);
+  const orgIframeTarget = frameTargets.find(t =>
+    t.url.startsWith("https://example.org")
+  );
+  const netIframeTarget = frameTargets.find(t =>
+    t.url.startsWith("https://example.net")
+  );
+
+  // The iframe only has a dedicated target when Fission or EFT is enabled
+  const orgIframeHighlighterTestFront = orgIframeTarget
+    ? await orgIframeTarget.getFront("highlighterTest")
+    : null;
+  const netIframeHighlighterTestFront = netIframeTarget
+    ? await netIframeTarget.getFront("highlighterTest")
+    : null;
+
+  let tabbingOrderHighlighterData =
+    await topLevelFrameHighlighterTestFront.getTabbingOrderHighlighterData();
+  is(
+    tabbingOrderHighlighterData.length,
+    0,
+    "Tabbing order is not visible at first"
+  );
+
+  info(`Click on "Show Tabbing Order" checkbox`);
+  const tabbingOrderCheckbox = doc.getElementById(
+    "devtools-display-tabbing-order-checkbox"
+  );
+  tabbingOrderCheckbox.click();
+
+  await waitUntilState(store, state => state.ui.tabbingOrderDisplayed === true);
+
+  is(tabbingOrderCheckbox.checked, true, "Checkbox is checked");
+  tabbingOrderHighlighterData =
+    await topLevelFrameHighlighterTestFront.getTabbingOrderHighlighterData();
+  if (isFissionEnabled()) {
+    // ⚠️ We don't get the highlighter for the <html> node of the iframe when Fission is enabled.
+    // This should be fix as part of Bug 1740509.
+    is(
+      JSON.stringify(tabbingOrderHighlighterData),
+      JSON.stringify([`button#top-btn-1 : 1`, `button#top-btn-2 : 4`]),
+      "Tabbing order is visible for the top level target after clicking the checkbox"
+    );
+
+    const orgIframeTabingOrderHighlighterData =
+      await orgIframeHighlighterTestFront.getTabbingOrderHighlighterData();
+    is(
+      JSON.stringify(orgIframeTabingOrderHighlighterData),
+      JSON.stringify([
+        `button#iframe-org-btn-1 : 2`,
+        `button#iframe-org-btn-2 : 3`,
+      ]),
+      "Tabbing order is visible for the org iframe after clicking the checkbox"
+    );
+
+    const netIframeTabingOrderHighlighterData =
+      await netIframeHighlighterTestFront.getTabbingOrderHighlighterData();
+    is(
+      JSON.stringify(netIframeTabingOrderHighlighterData),
+      JSON.stringify([`button#iframe-net-btn-1 : 5`]),
+      "Tabbing order is visible for the net iframe after clicking the checkbox"
+    );
+  } else {
+    is(
+      JSON.stringify(tabbingOrderHighlighterData),
+      JSON.stringify([
+        `button#top-btn-1 : 1`,
+        `html : 2`,
+        `button#iframe-org-btn-1 : 3`,
+        `button#iframe-org-btn-2 : 4`,
+        `button#top-btn-2 : 5`,
+        `html : 6`,
+        `button#iframe-net-btn-1 : 7`,
+      ]),
+      "Tabbing order is visible for the top level target after clicking the checkbox"
+    );
+  }
+
+  info(`Clicking on the checkbox again hides the highlighter`);
+  tabbingOrderCheckbox.click();
+  await waitUntilState(
+    store,
+    state => state.ui.tabbingOrderDisplayed === false
+  );
+
+  is(tabbingOrderCheckbox.checked, false, "Checkbox is unchecked");
+  tabbingOrderHighlighterData =
+    await topLevelFrameHighlighterTestFront.getTabbingOrderHighlighterData();
+  is(
+    tabbingOrderHighlighterData.length,
+    0,
+    "Tabbing order is not visible anymore after unchecking the checkbox"
+  );
+
+  if (isFissionEnabled()) {
+    const orgIframeTabingOrderHighlighterData =
+      await orgIframeHighlighterTestFront.getTabbingOrderHighlighterData();
+    is(
+      orgIframeTabingOrderHighlighterData.length,
+      0,
+      "Tabbing order is also hidden on the org iframe target"
+    );
+    const netIframeTabingOrderHighlighterData =
+      await netIframeHighlighterTestFront.getTabbingOrderHighlighterData();
+    is(
+      netIframeTabingOrderHighlighterData.length,
+      0,
+      "Tabbing order is also hidden on the net iframe target"
+    );
+  }
+
+  await closeTabToolboxAccessibility(tab);
+});