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HTML 

              
                <main>
  <h1>Keyboard Overflow Tests</h1>
  
  <p>
    This is an example for my post <cite><a href="http://adrianroselli.com/2016/02/keyboard-and-overflow.html">Keyboard and Overflow</a></cite>. That link also acts a handy tab-stop to see where you are as you start playing.
  </p>

  <h2>With Ellipsis</h2>
  
  <table id="Books-ellipsis" class="ellipsis">
    <colgroup>
      <col>
      <col>
      <col class="number">
    </colgroup>
    <thead>
      <tr>
        <th>Author</th>
        <th>Title</th>
        <th class="number">Year</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td><div>Homer</div></td>
        <td><div><em>Iliad</em></div></td>
        <td class="number"><div>BC ~800</div></td>
      </tr>
      <tr>
        <td><div>Miguel De Cervantes</div></td>
        <td><div ><em>The Ingenious Gentleman Don Quixote of La Mancha</em></div></td>
        <td class="number"><div>1605</div></td>
      </tr>
      <tr>
        <td><div>Mary Shelley</div></td>
        <td><div><em>Frankenstein; or, The Modern Prometheus</em></div></td>
        <td class="number"><div>1818</div></td>
      </tr>
      <tr>
        <td><div>Herman Melville</div></td>
        <td><div><em>Moby-Dick; or, The Whale</em></div></td>
        <td class="number"><div>1851</div></td>
      </tr>
      <tr>
        <td><div>Emma Dorothy Eliza Nevitte Southworth</div></td>
        <td><div><em>The Hidden Hand</em></div></td>
        <td class="number"><div>1888</div></td>
      </tr>
      <tr>
        <td><div>F. Scott Fitzgerald</div></td>
        <td><div><em>The Great Gatsby</em></div></td>
        <td class="number"><div>1925</div></td>
      </tr>
      <tr>
        <td><div>George Orwell</div></td>
        <td><div><em>Nineteen Eighty-Four</em></div></td>
        <td class="number"><div>1948</div></td>
      </tr>
      <tr>
        <td><div>Peter Weiss</div></td>
        <td><div><em>The Persecution and Assassination of Jean-Paul Marat as Performed by the Inmates of the Asylum of Charenton Under the Direction of the Marquis de Sade</em></div></td>
        <td class="number"><div>1963</div></td>
      </tr>                            
      <tr>
        <td><div>William Goldman</div></td>
        <td><div><em>The Princess Bride: S. Morgenstern's Classic Tale of True Love and High Adventure</em></div></td>
        <td class="number"><div>1973</div></td>
      </tr>
    </tbody>
  </table>

  <h2>With Scroll</h2>
  
  <table id="Books-scroll" class="scroll">
    <colgroup>
      <col>
      <col>
      <col class="number">
    </colgroup>
    <thead>
      <tr>
        <th>Author</th>
        <th>Title</th>
        <th class="number">Year</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td><div>Homer</div></td>
        <td><div><em>Iliad</em></div></td>
        <td class="number"><div>BC ~800</div></td>
      </tr>
      <tr>
        <td><div>Miguel De Cervantes</div></td>
        <td><div ><em>The Ingenious Gentleman Don Quixote of La Mancha</em></div></td>
        <td class="number"><div>1605</div></td>
      </tr>
      <tr>
        <td><div>Mary Shelley</div></td>
        <td><div><em>Frankenstein; or, The Modern Prometheus</em></div></td>
        <td class="number"><div>1818</div></td>
      </tr>
      <tr>
        <td><div>Herman Melville</div></td>
        <td><div><em>Moby-Dick; or, The Whale</em></div></td>
        <td class="number"><div>1851</div></td>
      </tr>
      <tr>
        <td><div>Emma Dorothy Eliza Nevitte Southworth</div></td>
        <td><div><em>The Hidden Hand</em></div></td>
        <td class="number"><div>1888</div></td>
      </tr>
      <tr>
        <td><div>F. Scott Fitzgerald</div></td>
        <td><div><em>The Great Gatsby</em></div></td>
        <td class="number"><div>1925</div></td>
      </tr>
      <tr>
        <td><div>George Orwell</div></td>
        <td><div><em>Nineteen Eighty-Four</em></div></td>
        <td class="number"><div>1948</div></td>
      </tr>
      <tr>
        <td><div>Peter Weiss</div></td>
        <td><div><em>The Persecution and Assassination of Jean-Paul Marat as Performed by the Inmates of the Asylum of Charenton Under the Direction of the Marquis de Sade</em></div></td>
        <td class="number"><div>1963</div></td>
      </tr>                            
      <tr>
        <td><div>William Goldman</div></td>
        <td><div><em>The Princess Bride: S. Morgenstern's Classic Tale of True Love and High Adventure</em></div></td>
        <td class="number"><div>1973</div></td>
      </tr>
    </tbody>
  </table>
  
  <p>
    This is an example for my post <cite><a href="http://adrianroselli.com/2016/02/keyboard-and-overflow.html">Keyboard and Overflow</a></cite>. That link also acts a handy tab-stop to see where you are as you finish playing.
  </p>

</main>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Lato:400,700);

body {
  background-color: #6D695C;
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAACVBMVEUAAAAAAAAAAACDY+nAAAAAA3RSTlMmDQBzGIDBAAAAG0lEQVR42uXIIQEAAADCMHj/0NdkQMws0HEeAqvwAUGJthrXAAAAAElFTkSuQmCC);
  font-size: 100%;
  color: #333;
  font-family: Lato, Arial, sans-serif;
  padding: 0;
  margin: 0;
}

main {
  display: block;
  box-sizing: border-box;
  /*width: 90%;
  margin: 1em auto;
  padding: 1em 2em;*/
  color: #000;
  background-color: rgba(204,204,204,.7);
  border: .07em solid rgba(0,0,0,.5);
  border-radius: .5em;
}

table {
  /*border: 1px dotted #00f;*/
  margin: 1em 0;
  border-collapse: collapse;
  width: 100%;
}

th, td {
  /*padding: .25em .5em .25em 1em;*/
  /*border: 1px dotted #0f0;*/
  vertical-align: text-top;
  text-align: left;
  /*text-indent: -.5em;*/
}

tr:nth-child(even) {
  background-color: rgba(255,255,255,.25);
}

tr:nth-child(odd) {
  background-color: rgba(0,0,0,.1);
}

th {
  vertical-align: bottom;
  background-color: rgba(0,0,0,.5);
  color: #fff;
  font-weight: bold;
}

td.right, th.right, td.number, th.number/*, col.number || td, col.right || td  CSS4 table col selector */ {
  text-align: right;
}

/* Experimental styles */

th {
  padding: .25em 1vw;
}


td:nth-of-type(1) {
  /*width: 25%;*/
}

td:nth-of-type(1) div {
  width: 12em;
  width: 20vw;
}

td:nth-of-type(2) {
  /*width: 65%;*/
}

td:nth-of-type(2) div {
  width: 20em;
  width: 60vw;
}

td:nth-of-type(3) {
  /*width: 10%;*/
}

td:nth-of-type(23) div {
  width: 12vw;
}

td {
  position: relative;
  min-height: 1em;
  padding: 0;
  text-indent: 0;
}

td div {
  box-sizing: border-box;
  /*height: 1.7em;*/
  /*width: 100%;*/
  /*max-width: 10em;*/ /* apparently i need a set size, not a % */
  /*width: calc(100%/2);*/
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  /*display: block;*/
  margin: 0;
  padding: 0;
  /*outline: 1px dotted #f00;*/
  padding: .25em .5vw .25em 1vw;
  text-indent: -.5vw;
  /*display: inline;*/
}

.scroll td div {
  overflow: scroll;
  text-overflow: initial;
  white-space: normal;
}

.ellipsis td div:focus, .ellipsis td div:hover {
  height: auto;
  position: absolute;
  width: 100%;
  max-width: 100%;
  white-space: normal;
  overflow: visible;
  text-overflow: initial;
  z-index: 1;
  outline: 1px solid #999;
}

.scroll td div, .scroll td div:focus, .scroll td div:hover {
  overflow: auto;
  height: 2em;
}

.scroll td div:focus, .scroll td div:hover {
  outline: 1px solid #999;
}

tr:nth-child(even), tr:nth-child(even) div {
  background-color: #ccc;
}

tr:nth-child(odd),tr:nth-child(odd) div {
  background-color: #ddd;
}

main {
  position: relative;
}

main {
  width: auto;
  padding: 1em 2vw;
  margin: 1em 2vw;
}


/*

2 | 2 main 2 | 2 == 8

0 | 0 table 0 | 0 == 0

0 | 0 td 0 | 0 == 0

cols have 100 - 8 = 92 to split by three...

20, 60, 12


0 | 1 div .5 | 0 == 1.5  x  3 == 4.5

*/
!

JS 

              
                // Checking to see if there is probably an ellipsis
function CheckOverflow(aDiv) {
  try{
    eID = aDiv;
    // There is no way to test for presense of ellipsis, so we
    // compare the width/height with the clipped width/height
    if (eID.scrollWidth > eID.offsetWidth || eID.scrollHeight > eID.offsetHeight) {
      // element probably has ellipsis
      // console.log('yep!');
      return true;
    } else {
      // element probably does not overflow
    }
  } catch(e) {
    console.log('CheckOverflow(): ' + e);
  }
}
// Adding accessibility attributes
function AddKbdAttrs(aDiv) {
  try{
    // Get the element with the passed ID
    //eID = document.getElementById(divID);
    eID = aDiv;
    //eID.style.backgroundColor = '#0f0';
    // Give the element a tabindex=0 so it has a tab stop
    eID.setAttribute('tabindex', '0');
    // Give it a role so screen readers know this is a thing
    eID.setAttribute('role', 'region');
    // Now give it a label so screen readers know why it's a thing
    eID.setAttribute('aria-label', 'Text that visually overflows.');
  } catch(e) {
    console.log('AddKbdAttrs(): ' + e);
  }
}
// Find elements within a given container and see if they are candidates
// to have content overflowing with an ellipsis, then add the appropriate
// accessibility attributes for keyboard users that also keep screen
// reader users from getting an aural assault
function PossibleOverflows(containerID) {
  try{
    // Get the element with the passed ID
    // I do this to reduce the number of nodes to traverse
    // To-do: Modify function to use document root if blank
    var eID = document.getElementById(containerID);
    // Get all the elements that match the selector
    // You could put your own in here to reduce the resultant node list
    var matches = eID.querySelectorAll('div');
    // Return the node list count
    // console.log(matches.length);
    // Now loop
    for( i=0; i < matches.length; i++ ) {
      var match = matches[i];
      // Get the rendered style of each
      var computedStyle = window.getComputedStyle(match, null);
      // Now get the overflow property
      var computedOverflow = computedStyle.getPropertyValue('overflow');
      //console.log(computedOverflow);
      // If it is hidden, do stuff
      if (computedOverflow === 'hidden') {
        // Now identify if it is set to use an ellipsis
        var hasEllipsis = computedStyle.getPropertyValue('text-overflow') === 'ellipsis';
        // Now check if this matches
        //console.log(window.getComputedStyle(match, null).textOverflow);
        if (hasEllipsis) {
          // Now check it against my ellipsis function
          var anyEllipsis = CheckOverflow(match);
          // If the function says it's ellipsising, call the function to add attrs
          if (anyEllipsis === true) {
            // Call function to add attributes
            AddKbdAttrs(match);
          }
        }
      } else if (computedOverflow === 'scroll' || computedOverflow === 'auto') {
        // Now identify if the overflow is scrolling (auto, scroll, scroll-x, scroll-y)
        //console.log('foo');
        var probablyScroll = CheckOverflow(match);
        if (probablyScroll === true) {
          // Call function to add attributes
          AddKbdAttrs(match);
        }
      }
    }
  } catch(e) {
    console.log('PossibleOverflows(): ' + e);
  }  
}


//PossibleOverflows('Books-ellipsis');
//PossibleOverflows('Books-scroll');

window.onload = PossibleOverflows('Books-ellipsis');
window.onload = PossibleOverflows('Books-scroll');

//window.onresize = PossibleOverflows('Books-ellipsis');
//window.onresize = PossibleOverflows('Books-scroll');
!
999px

Console