chromium/third_party/blink/web_tests/external/wpt/html/interaction/focus/chrome-object-tab-focus-bug.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Tabbing through object tag</title>
<link rel="author" title="[email protected]">
<link rel="help" href="https://crbug.com/1132895">
<meta assert="assert" content="Tabbed focus works through OBJECT tags">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<p>Pressing TAB twice should focus/highlight end checkbox</p>

<input type="checkbox" id="start">start</a>
<object type='text/html' data='data:text/html,' width='16' height='16'></object>
<input type="checkbox" id="end" >end</a>

<script>

let t = async_test("focus advances with tab key thorough object element");

let start = document.querySelector("#start");
let object = document.querySelector("object");
let end = document.querySelector("#end");
let tab = "\uE004";

t.step( _ => {
  document.querySelector("#start").focus();
  assert_equals(document.activeElement, start, "start got focus");
  test_driver.send_keys(document.activeElement, tab).then( _ => {
    t.step( _ => {
      assert_equals(document.activeElement, object, "object got focus");
      test_driver.send_keys(document.activeElement, tab).then( _ => {
        t.step( _ => {
          assert_equals(document.activeElement, end, "end got focus");
          t.done();
        });
      });
    });
  });
});

</script>