1 files changed, 47 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-canvas-element/canvas-descendants-focusability-004.tentative.html b/testing/web-platform/tests/html/semantics/embedded-content/the-canvas-element/canvas-descendants-focusability-004.tentative.html
new file mode 100644
index 0000000000..5d8dfcd2f4
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-canvas-element/canvas-descendants-focusability-004.tentative.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8" />
+<title>Canvas descendants focusability</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/canvas.html#being-used-as-relevant-canvas-fallback-content">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#focusable-area">
+<link rel="help" href="https://github.com/whatwg/html/issues/7534">
+<meta name="assert" content="Checks that elements being used as relevant canvas
+    fallback content can't be focusable if they are not in the flat tree.">
+<div id="log"></div>
+<canvas>
+  <section id="shadow-host">
+    <button data-focusable="false"></button>
+    <section tabindex="-1" data-focusable="false">
+      <div tabindex="-1" data-focusable="false"></div>
+      <span tabindex="-1" data-focusable="false"></span>
+      <a href="#" data-focusable="false"></a>
+    </section>
+  </section>
+</canvas>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+setup(() => {
+  const canvas = document.querySelector("canvas");
+  assert_greater_than(canvas.getClientRects().length, 0, "Canvas is rendered");
+  const shadowHost = document.getElementById("shadow-host");
+  const shadowRoot = shadowHost.attachShadow({ mode: "open" });
+  const slot = document.createElement("slot");
+  slot.name = "slot";
+  shadowRoot.appendChild(slot);
+});
+for (let element of document.querySelectorAll("[data-focusable]")) {
+  let title = element.cloneNode(false).outerHTML.toLowerCase();
+  title = title.slice(0, title.lastIndexOf("<"));
+  test(function() {
+    assert_equals(element.getClientRects().length, 0, "Not rendered");
+    assert_true(document.activeElement !== element, "Not initially focused");
+    element.focus();
+    if (JSON.parse(element.dataset.focusable)) {
+      assert_true(document.activeElement === element, "Should be focused");
+    } else {
+      assert_true(document.activeElement !== element, "Shouldn't be focused");
+    }
+  }, title);
+}
+</script>