layout/style/test/test_flexbox_focus_order.html

   1 <!DOCTYPE html>
   2 <html>
   3 <!--
   4 https://bugzilla.mozilla.org/show_bug.cgi?id=812687
   5 -->
   6 <head>
   7   <title>Test for Bug 812687: focus order of reordered flex items</title>
   8   <script src="/tests/SimpleTest/SimpleTest.js"></script>
   9   <script src="/tests/SimpleTest/EventUtils.js"></script>
  10   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
  11   <style>
  12     .container { display: flex; }
  13
  14     #focus1 { background: yellow;    }
  15     #focus2 { background: lightgray; }
  16     #focus3 { background: orange;    }
  17     #focus4 { background: lightblue; }
  18     #focus5 { background: pink;      }
  19   </style>
  20 </head>
  21 <body>
  22 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=812687">Mozilla Bug 812687</a>
  23 <p id="display">
  24   <a href="#" id="beforeContainer">Link before container</a>
  25   <!-- This flex container's children are reordered visually with the "order"
  26        CSS property, but their focus order (when tabbing through them) should
  27        match their DOM order. So, #focus1 should receive focus before the other
  28        flex items, even though it isn't visually the first flex item.  And so
  29        on, up to #focus5, which is visually first (due to its negative "order"
  30        value) but should be focused last (due to being last in the DOM). -->
  31   <div class="container">
  32     <a href="#" id="focus1">1</a>
  33     <div><a href="#" id="focus2">2</a></div>
  34     <div style="order: 100"><a href="#" id="focus3">3</a></div>
  35     <div><a href="#" id="focus4">4</a></div>
  36     <a href="#" id="focus5" style="order: -1">5</a>
  37   </div>
  38 </p>
  39 <div id="content" style="display: none"></div>
  40
  41 <pre id="test">
  42 <script class="testbody" type="text/javascript">
  43
  44 /** Test for Bug 812687 **/
  45
  46 const gExpectedFocusedIds = [
  47   "focus1",
  48   "focus2",
  49   "focus3",
  50   "focus4",
  51   "focus5"
  52 ];
  53
  54 function doTest() {
  55   // First, we focus something just before the flex container:
  56   document.getElementById('beforeContainer').focus();
  57   is(document.activeElement, document.getElementById('beforeContainer'),
  58      "explicitly-focused link should gain focus");
  59
  60   // And then we advance focus across the focusable things in the flex container
  61   // and check that we traverse them in the expected order:
  62   for (let expectedId of gExpectedFocusedIds) {
  63     synthesizeKey("KEY_Tab");
  64     is(document.activeElement, document.getElementById(expectedId),
  65        "expecting element '#" + expectedId + "' to be focused");
  66   }
  67
  68   SimpleTest.finish();
  69 }
  70
  71 // Before we start, we have to bump Mac to make its 'tab'-key focus behavior
  72 // predicatble:
  73 function begin() {
  74   SpecialPowers.pushPrefEnv({ set: [[ "accessibility.tabfocus", 7 ]] }, doTest);
  75 }
  76
  77 SimpleTest.waitForExplicitFinish();
  78 addLoadEvent(begin);
  79
  80 </script>
  81 </pre>
  82 </body>
  83 </html>