test_flexbox_focus_order.html

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<!DOCTYPE html>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=812687

-->

<head>

  <title>Test for Bug 812687: focus order of reordered flex items</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script src="/tests/SimpleTest/EventUtils.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

  <style>

    .container { display: flex; }

    #focus1 { background: yellow;    }

    #focus2 { background: lightgray; }

    #focus3 { background: orange;    }

    #focus4 { background: lightblue; }

    #focus5 { background: pink;      }

  </style>

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=812687">Mozilla Bug 812687</a>

<p id="display">

  <a href="#" id="beforeContainer">Link before container</a>

  <!-- This flex container's children are reordered visually with the "order"

       CSS property, but their focus order (when tabbing through them) should

       match their DOM order. So, #focus1 should receive focus before the other

       flex items, even though it isn't visually the first flex item.  And so

       on, up to #focus5, which is visually first (due to its negative "order"

       value) but should be focused last (due to being last in the DOM). -->

  <div class="container">

    <a href="#" id="focus1">1</a>

    <div><a href="#" id="focus2">2</a></div>

    <div style="order: 100"><a href="#" id="focus3">3</a></div>

    <div><a href="#" id="focus4">4</a></div>

    <a href="#" id="focus5" style="order: -1">5</a>

  </div>

</p>

<div id="content" style="display: none"></div>

<pre id="test">

<script class="testbody" type="text/javascript">

/** Test for Bug 812687 **/

const gExpectedFocusedIds = [

  "focus1",

  "focus2",

  "focus3",

  "focus4",

  "focus5"

];

function doTest() {

  // First, we focus something just before the flex container:

  document.getElementById('beforeContainer').focus();

  is(document.activeElement, document.getElementById('beforeContainer'),

     "explicitly-focused link should gain focus");

  // And then we advance focus across the focusable things in the flex container

  // and check that we traverse them in the expected order:

  for (let expectedId of gExpectedFocusedIds) {

    synthesizeKey("KEY_Tab");

    is(document.activeElement, document.getElementById(expectedId),

       "expecting element '#" + expectedId + "' to be focused");

  SimpleTest.finish();

// Before we start, we have to bump Mac to make its 'tab'-key focus behavior

// predicatble:

function begin() {

  SpecialPowers.pushPrefEnv({ set: [[ "accessibility.tabfocus", 7 ]] }, doTest);

SimpleTest.waitForExplicitFinish();

addLoadEvent(begin);

</script>

</pre>

</body>

</html>