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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

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CSS

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HTML 

              
                <html class="win-hoverable">
<head>
    <title>WinJS: SplitView and XYFocus</title>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta charset="UTF-8">
</head>
<body class="win-type-body">
<div id="content">
    <div id="app">
        <div class="splitView win-splitview win-disposable win-splitview-placementleft win-splitview-closeddisplayinline win-splitview-openeddisplayoverlay win-splitview-pane-closed"
             data-win-control="WinJS.UI.SplitView" 
             id="element__1">
                <div class="win-splitview-pane" 
                     tabindex="-1">
                    <!-- Pane area -->
                    <div>
                        <div class="header">
                            <button tabindex="1" 
                                    class="win-splitviewpanetoggle start"
                                    data-win-control="WinJS.UI.SplitViewPaneToggle"
                                    data-win-options="{ splitView: select('.splitView') }" 
                                    type="button"></button>
                            <div class="title" style="padding-left: 10px;">SplitView Pane area</div>
                        </div>

                        <div class="nav-commands">
                            <div tabindex="2" 
                                 data-win-control="WinJS.UI.SplitViewCommand"
                                 data-win-options="{ label: 'Home', icon: 'home'}">
                            </div>
                            <div tabindex="3" 
                                 data-win-control="WinJS.UI.SplitViewCommand"
                                 data-win-options="{ label: 'Favorite', icon: 'favorite'}"
                                 class="win-navbarcommand win-disposable">
                            </div>
                            <div tabindex="4" 
                                 data-win-control="WinJS.UI.SplitViewCommand "
                                 data-win-options="{ label: 'Settings', icon: 'settings'}"
                                 class="win-navbarcommand win-disposable">
                            </div>
                        </div>

                    </div>
                </div>
            </div>
            <div class="win-splitview-contentwrapper" 
                 style="position: absolute; top: 0px; margin-left: 50px;">
                <div class="win-splitview-content">
                    <!-- Content area -->
                    <div class="contenttext">
                      <h2 class="win-h2">SplitView Content area</h2>
                      
                      <table>
                        <tr>
                            <td class="verticalstacking">
                                <div id="splitViewFocusToggle" 
                                     data-win-control="WinJS.UI.ToggleSwitch" 
                                     data-win-options="{title: 'SplitView Toggle Button Default Focus (XYFocus)', checked: false, onchange: toggleSplitViewFocus}">
                                </div>
                            </td>
                        </tr>
                      </table>             
                      <p>Use the keyboard arrows to navigate the menu.</p>
                      <p>Press enter when SplitView toggle button acquires focus</p>
                      <p>The toggle on/off button activates the focus on the SplitView toggle button</p>
                    </div>
                </div>
            </div>
        </div>

    </div>


</div>

</body>
</html>
!

CSS 

              
                /* CSS needs to clean up */

.content {
    /* Enables scrolling and disables margin collapsing between #content and its descendants */
    overflow: auto;

    height: 100%;
}
body {
    overflow: hidden; /* Disable margin collapsing between body and its descendants */
    -webkit-transform: translate3d(0, 0, 0); /*force hardware acceleration*/
}

.box { padding: 8px; }

::-webkit-scrollbar {
    background-color:transparent;
}

::-webkit-scrollbar-thumb
{
    border:1px solid rgba(220,220,220, 0.3);
}

.win-searchbox ::-webkit-scrollbar 
{
    background-color:white;
}

.win-searchbox ::-webkit-scrollbar-thumb
{
    border:1px solid gray;
    background-color:silver;
}

a, a:visited, a:hover, a:active {
    cursor:pointer;
    color: rgba(212, 14, 136, 1);
}

.win-listview .win-viewport { 
    -webkit-overflow-scrolling: touch; 
}

.win-listview .win-itemsblock,
.win-listview .win-vertical .win-itemscontainer,
.win-listview .win-vertical .win-itemsblock:not(.win-clip) {
        margin:0;
        padding:0;
}

.win-link,
.win-progress-bar,
.win-progress-ring,
.win-ring {
  color: rgb(0, 120, 215);
}
::selection,
.win-button.win-button-primary,
.win-dropdown option:checked,
select[multiple].win-dropdown option:checked {
  background-color: rgb(0, 120, 215);
}
.win-textbox:focus,
.win-textarea:focus,
.win-textbox:focus:hover,
.win-textarea:focus:hover {
  border-color: rgb(0, 120, 215);
}
.win-textbox::-ms-clear:hover:not(:active),
.win-textbox::-ms-reveal:hover:not(:active) {
  color: rgb(0, 120, 215);
}
.win-checkbox:checked::-ms-check,
.win-textbox::-ms-clear:active,
.win-textbox::-ms-reveal:active {
  background-color: rgb(0, 120, 215);
}
.win-progress-bar::-webkit-progress-value,
.win-progress-ring::-webkit-progress-value,
.win-ring::-webkit-progress-value {
  background-color: rgb(0, 120, 215);
}
.win-progress-bar:not(:indeterminate)::-moz-progress-bar,
.win-progress-ring:not(:indeterminate)::-moz-progress-bar,
.win-ring:not(:indeterminate)::-moz-progress-bar {
  background-color: rgb(0, 120, 215);
}
.win-checkbox:indeterminate::-ms-check,
.win-checkbox:hover:indeterminate::-ms-check,
.win-radio:checked::-ms-check {
  border-color: rgb(0, 120, 215);
}
.win-slider::-ms-thumb,
.win-slider::-ms-fill-lower {
  background: rgb(0, 120, 215);
}
.win-slider::-webkit-slider-thumb {
  background: rgb(0, 120, 215);
}
.win-slider::-moz-range-thumb {
  background: rgb(0, 120, 215);
}
.win-listview:not(.win-selectionstylefilled) .win-selectioncheckmarkbackground,
.win-itemcontainer:not(.win-selectionstylefilled) .win-selectioncheckmarkbackground {
  border-color: rgb(0, 120, 215);
  background-color: rgb(0, 120, 215);
}
.win-listview:not(.win-selectionstylefilled) .win-container.win-selected .win-selectionborder,
.win-itemcontainer:not(.win-selectionstylefilled).win-container.win-selected .win-selectionborder {
  border-color: rgb(0, 120, 215);
}
.win-listview.win-selectionstylefilled .win-selected .win-selectionbackground,
.win-itemcontainer.win-selectionstylefilled.win-selected .win-selectionbackground {
  background-color: rgb(0, 120, 215);
}
.win-rating .win-star.win-user.win-full,
.win-rating .win-star.win-user.win-full.win-disabled {
  color: rgb(0, 120, 215);
}
.win-toggleswitch-on .win-toggleswitch-track {
  border-color: rgb(0, 120, 215);
}
.win-semanticzoom-zoomedoutview .win-hub-section-header-interactive .win-hub-section-header-content,
.win-hub-section-header-interactive .win-hub-section-header-chevron {
  color: rgb(0, 120, 215);
}
button[aria-checked=true].win-command:before,
.win-menu-containsflyoutcommand button.win-command-flyout-activated:before {
  background-color: rgb(0, 120, 215);
  border-color: rgb(0, 120, 215);
}
.win-flyout,
.win-settingsflyout {
  border-color: rgb(0, 120, 215);
}
html.win-hoverable .win-autosuggestbox .win-autosuggestbox-suggestion-selected:hover {
  background-color: rgba(0, 120, 215, 0.8);
}
html.win-hoverable .win-ui-light .win-autosuggestbox .win-autosuggestbox-suggestion-selected:hover,
html.win-hoverable .win-ui-light.win-autosuggestbox .win-autosuggestbox-suggestion-selected:hover {
  background-color: rgba(0, 120, 215, 0.6);
}
.win-autosuggestbox .win-autosuggestbox-suggestion-selected {
  background-color: rgba(0, 120, 215, 0.6);
}
.win-ui-light .win-autosuggestbox .win-autosuggestbox-suggestion-selected,
.win-ui-light.win-autosuggestbox .win-autosuggestbox-suggestion-selected {
  background-color: rgba(0, 120, 215, 0.4);
}
.win-autosuggestbox .win-autosuggestbox-suggestion-selected.win-autosuggestbox-suggestion-selected:hover:active {
  background-color: rgba(0, 120, 215, 0.9);
}
.win-ui-light .win-autosuggestbox .win-autosuggestbox-suggestion-selected.win-autosuggestbox-suggestion-selected:hover:active,
.win-ui-light.win-autosuggestbox .win-autosuggestbox-suggestion-selected.win-autosuggestbox-suggestion-selected:hover:active {
  background-color: rgba(0, 120, 215, 0.7);
}
html.win-hoverable .win-searchbox-button:not(.win-searchbox-button-disabled):hover {
  color: rgb(0, 120, 215);
}
.win-searchbox-button.win-searchbox-button:not(.win-searchbox-button-disabled):hover:active {
  background-color: rgb(0, 120, 215);
}
html.win-hoverable .win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened:hover {
  background-color: rgba(0, 120, 215, 0.8);
}
html.win-hoverable .win-ui-light .win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened:hover,
html.win-hoverable .win-ui-light.win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened:hover {
  background-color: rgba(0, 120, 215, 0.6);
}
html.win-hoverable .win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened:hover.win-pressed {
  background-color: rgba(0, 120, 215, 0.9);
}
html.win-hoverable .win-ui-light .win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened:hover.win-pressed,
html.win-hoverable .win-ui-light.win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened:hover.win-pressed {
  background-color: rgba(0, 120, 215, 0.7);
}
.win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened {
  background-color: rgba(0, 120, 215, 0.6);
}
.win-ui-light .win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened,
.win-ui-light.win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened {
  background-color: rgba(0, 120, 215, 0.4);
}
.win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened.win-pressed {
  background-color: rgba(0, 120, 215, 0.9);
}
.win-ui-light .win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened.win-pressed,
.win-ui-light.win-navbarcommand-splitbutton.win-navbarcommand-splitbutton-opened.win-pressed {
  background-color: rgba(0, 120, 215, 0.7);
}
.win-contentdialog-dialog {
  outline-color: rgb(0, 120, 215);
}
/***/
.content,
#app {
    height: 100%;
}

    #app .win-splitviewpanetoggle {
        float: left;
    }

    /* SplitView pane content style*/
    #app .header {
        white-space: nowrap;
    }
    
    #app .header > button:focus{
        background: blue;
    }

    #app .title {
        font-size: 25px;
        left: 50px;
        margin-top: 6px;
        vertical-align: middle;
        display: inline-block;
    }

    #app .nav-commands {
        margin-top: 20px;
    }
    
    #app .nav-commands > div:focus{
        background: blue;
    }

.win-navbarcommand-button {
    background-color: transparent;
}

#app .win-splitview-pane-hidden .win-navbarcommand-button {
    width: 46px;
}

#app .win-splitview-pane-hidden .win-navbarcommand-label {
    /* Workaround: Make sure pane doesn't scroll if ContentDialog restores focus to
       NavBarCommand's label
    */
    visibility: hidden;
}

/*SplitView content style*/
#app .win-splitview-content {
    background-color: rgb(112,112,112);
}

#app .contenttext {
    margin-left: 20px;
    margin-top: 6px;
}

@font-face {
    font-family: 'wf_segoe-ui_light';
    src: url('https://winjs.azurewebsites.net/i.s-microsoft.com/fonts/segoe-ui/west-european/light/latest.eot');
    src: url('https://winjs.azurewebsites.net/i.s-microsoft.com/fonts/segoe-ui/west-european/light/latest.eot?#iefix') format('embedded-opentype'),url('https://winjs.azurewebsites.net/i.s-microsoft.com/fonts/segoe-ui/west-european/light/latest.woff') format('woff'),url('https://winjs.azurewebsites.net/i.s-microsoft.com/fonts/segoe-ui/west-european/light/latest.ttf') format('truetype'),url('https://winjs.azurewebsites.net/i.s-microsoft.com/fonts/segoe-ui/west-european/light/latest.svg#web') format('svg');
    font-weight: normal;
    font-style: normal;
}

#content {
    /* Enables scrolling and disables margin collapsing between #content and its descendants */
    overflow: auto;

    height: 100%;
}
body {
    overflow: hidden; /* Disable margin collapsing between body and its descendants */
    -webkit-transform: translate3d(0, 0, 0); /*force hardware acceleration*/
}

.box { padding: 8px; }

::-webkit-scrollbar {
    background-color:transparent;
}

::-webkit-scrollbar-thumb
{
    border:1px solid rgba(220,220,220, 0.3);
}

.win-searchbox ::-webkit-scrollbar 
{
    background-color:white;
}

.win-searchbox ::-webkit-scrollbar-thumb
{
    border:1px solid gray;
    background-color:silver;
}

a, a:visited, a:hover, a:active {
    cursor:pointer;
    color: rgba(212, 14, 136, 1);
}

.win-listview .win-viewport { 
    -webkit-overflow-scrolling: touch; 
}

.win-listview .win-itemsblock,
.win-listview .win-vertical .win-itemscontainer,
.win-listview .win-vertical .win-itemsblock:not(.win-clip) {
        margin:0;
        padding:0;
}
.contenttext{
  color: white;
}
!

JS 

              
                (function() {
  // Wire XYFocus up to the arrow keys
  WinJS.UI.XYFocus.keyCodeMap.up.push(WinJS.Utilities.Key.upArrow);
  WinJS.UI.XYFocus.keyCodeMap.down.push(WinJS.Utilities.Key.downArrow);
  WinJS.UI.XYFocus.keyCodeMap.left.push(WinJS.Utilities.Key.leftArrow);
  WinJS.UI.XYFocus.keyCodeMap.right.push(WinJS.Utilities.Key.rightArrow);

  WinJS.UI.processAll().done(function () {

      var splitView = document.querySelector(".splitView").winControl;
      new WinJS.UI._WinKeyboard(splitView.paneElement); // Temporary workaround: Draw keyboard focus visuals on NavBarCommands

      var startItem = document.querySelector('.start');
    
      var toggleSplitViewFocus = function() {
          var obj = document.getElementById("splitViewFocusToggle").winControl;
          console.log("SplitView Button Focus toggled. Current status: " + (obj.checked ? "on" : "off"));
          if (obj.checked){
            startItem.focus();    
          }else{
            startItem.blur();    
          }
      }

      var splitViewFocusToggle = document.querySelector("#splitViewFocusToggle");
      splitViewFocusToggle.addEventListener("change", toggleSplitViewFocus);
      
     
    
     
  });
  
})();
!
999px

Console