slot-element-tabbable.tentative.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/rendering/non-replaced-elements/flow-content-0/slot-element-tabbable.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>CSS Test (Display): <slot> elements should be tabbable</title>

<link rel="author" title="L. David Baron" href="https://dbaron.org/">

<link rel="author" title="Google" href="http://www.google.com/">

<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#flow-content-3">

<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/2632">

<link rel="help" href="https://github.com/whatwg/html/issues/1837">

<link rel="help" href="https://github.com/whatwg/html/pull/9425">

<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1366037">

<!--

  This requirement is not particularly clear from current specs,

  so this test is tentative.  See issues above.

-->

<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>

<body>

<div id="before" tabindex="1" style="height: 10px"></div>

<script>

  function do_test(slot_style, description) {

    promise_test(

      async () => {

        let before = document.getElementById("before");

        before.focus();

        let host = document.createElement("div");

        document.body.appendChild(host);

        var root = host.attachShadow({mode:"open"});

        root.innerHTML = `

          <style>

            slot       { --test-value: slot-not-focused; }

            slot:focus { --test-value: slot-is-focused; }

          </style>

          <slot tabindex="1" style="${slot_style}"></slot>

`;

        let slot = root.querySelector("slot");

        let cs = getComputedStyle(slot);

        assert_equals(document.activeElement, before, "precondition");

        assert_not_equals(root.activeElement, slot, "precondition");

        assert_equals(cs.getPropertyValue("--test-value"), "slot-not-focused", "precondition (style)");

        await test_driver.send_keys(before, "\uE004");

        assert_equals(root.activeElement, slot, "slot is now focused");

        assert_equals(cs.getPropertyValue("--test-value"), "slot-is-focused", "slot is now focused (style)");

        document.body.removeChild(host);

      }, `slot element with ${description} should be focusable`);

  do_test("display: block", "display: block");

  do_test("", "default style");

</script>