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HTML 

              
                <main class="namespace">
    <h2>$('container.selector').tooltip()</h2>
    <small>Fully accessible tooltip jQuery plugin with delegation.</small>
    <p>Delegate tooltip binding to <code>body</code> or other view container(s) as needed.<br />Ideal for restricting event listening to view containers that re-render content.</p>
    <table>
        <tr>
            <td>
                <button type="button">+
                    <span class="tooltip tip-bottom-right" role="tooltip">Tip: bottom-right</span>
                </button>
            </td>
            <td>
                <button type="button">+
                    <span class="tooltip tip-bottom" role="tooltip">Tip: bottom<br />This is the default.</span>
                </button>
            </td>
            <td>
                <button type="button">+
                    <span class="tooltip tip-bottom-left" role="tooltip">Tip: bottom-left</span>
                </button>
            </td>
        </tr>
        <tr>
            <td>
                <button type="button">+
                    <span class="tooltip tip-right" role="tooltip">Tip: right</span>
                </button>
            </td>
            <td>
                <span>&nbsp;</span>
            </td>
            <td>
                <button type="button">+
                    <span class="tooltip tip-left" role="tooltip">Tip: left</span>
                </button>
            </td>
        </tr>
        <td>
            <button type="button">+
                <span class="tooltip tip-top-right" role="tooltip">Tip: top-right</span>
            </button>
        </td>
        <td>
            <button type="button">+
                <span class="tooltip tip-top" role="tooltip">Tip: top</span>
            </button>
        </td>
        <td>
            <button type="button">+
                <span class="tooltip tip-top-left" role="tooltip">Tip: top-left</span>
            </button>
        </td>
    </table>
</main>
!

CSS 

              
                html {
    font-size: 62.5%;
}
body {
    font-family: Calibri, Candara, Segoe, 'Segoe UI', Optima, Arial, sans-serif;
    font-size: 1.6em;
}
main {
    margin: 1em;
    text-align: center;
}
h2 {
    margin: 0 0 1em;
    font-size: 2.4rem;
    line-height: 1;
    text-align: center;
}
table {
    table-layout: fixed;
    border-collapse: collapse;
    margin: 0 auto;
    padding: 0;
    border: none;
}
td {
    padding: .2em;
}
button {
    /* Tooltip parent must have these base styles */
    position: relative;
    overflow: visible;
}

/* Tooltip shared base styles */
.tooltip {
    position: absolute;
    z-index: 2;
    overflow: hidden;
    clip: rect(0,0,0,0);
    box-sizing: border-box;
    width: 0;
    height: 0;
    padding: 0;
    cursor: default;
    color: #fff;
    font-family: Helvetica, Arial, sans-serif;
    font-size: 14px;
    font-size: 1.4rem;
    line-height: normal;
    text-align: center;
    white-space: nowrap;
    border-width: 0;
    border-style: solid;
    border-color: #6d6e71;
    border-top-color: #373739;
    background-color: #373739;
    opacity: 0;
    transition: opacity .3s ease-in .3s;
}

/* Tooltip visibility class toggled by jQuery */
.tooltip.isVisible {
    overflow: visible;
    clip: auto;
    width: auto;
    height: auto;
    padding: 10px 15px;
    border-width: 1px;
    opacity: 1;
}

/* Tooltip positioning */
/** Common styles: Horizontally Centered **/
.tooltip, /*** Default is equivalent to .tip-bottom ***/
.tooltip.tip-bottom,
.tooltip.tip-top {
    left: 50%;
    -webkit-transform: translate(-50%, 0);
        -ms-transform: translate(-50%, 0);
            transform: translate(-50%, 0);
}
/** Common styles: Bottom positions **/
.tooltip, /*** Default is equivalent to .tip-bottom ***/
.tooltip.tip-bottom,
.tooltip.tip-bottom-left,
.tooltip.tip-bottom-right {
    top: 110%;
    top: calc(100% + 5px);
}
/** Common styles: Top positions **/
.tooltip.tip-top,
.tooltip.tip-top-left,
.tooltip.tip-top-right {
    top: auto;
    bottom: 110%;
    bottom: calc(100% + 5px);
}
/** Common styles: Corner positions **/
.tooltip.tip-bottom-left,
.tooltip.tip-bottom-right,
.tooltip.tip-top-left,
.tooltip.tip-top-right {
    -webkit-transform: none;
        -ms-transform: none;
            transform: none;
}
/** Common styles: Left corner positions **/
.tooltip.tip-bottom-left,
.tooltip.tip-top-left {
    right: 50%;
    left: auto;
    margin-right: -25px;
}
/** Common styles: Right corner positions **/
.tooltip.tip-bottom-right,
.tooltip.tip-top-right {
    margin-left: -25px;
}
/** Common styles: Vertically Centered **/
.tooltip.tip-left,
.tooltip.tip-right {
    top: 50%;
    -webkit-transform: translate(0, -50%);
        -ms-transform: translate(0, -50%);
            transform: translate(0, -50%);
}
/** Left position only **/
.tooltip.tip-left {
    right: 110%;
    right: calc(100% + 5px);
    left: auto;
}
/** Right position only **/
.tooltip.tip-right {
    left: 110%;
    left: calc(100% + 5px);
}

/* Tooltip arrow shared base styles */
.tooltip:after {
    content: ' ';
    display: block;
    position: absolute;
    width: 0;
    height: 0;
    border-width: 10px;
    border-style: solid;
    pointer-events: none;
}
/** Common styles: Horizontally Centered, Up/Down arrows **/
.tooltip:after, /*** Default is equivalent to .tip-bottom:after; ***/
.tooltip.tip-bottom:after,
.tooltip.tip-top:after {
    left: 50%;
    margin-left: -10px;
}
/** Common styles: Up arrow **/
.tooltip:after, /*** Default is equivalent to .tip-bottom:after; ***/
.tooltip.tip-bottom:after,
.tooltip.tip-bottom-left:after,
.tooltip.tip-bottom-right:after {
    top: -20px;
    border-color: transparent transparent #373739 transparent;
}
/** Common styles: Down arrow **/
.tooltip.tip-top:after,
.tooltip.tip-top-left:after,
.tooltip.tip-top-right:after{
    top: auto;
    bottom: -20px;
    border-color: #373739 transparent transparent transparent;
}
/** Common styles: Left-/Right-aligned, Up/Down arrows **/
.tooltip.tip-bottom-left:after,
.tooltip.tip-bottom-right:after,
.tooltip.tip-top-left:after,
.tooltip.tip-top-right:after {
    margin-left: 0;
}
/** Common styles: Right-aligned, Up/Down arrows **/
.tooltip.tip-bottom-left:after,
.tooltip.tip-top-left:after {
    right: 15px;
    left: auto;
}
/** Common styles: Left-aligned, Up/Down arrows **/
.tooltip.tip-bottom-right:after,
.tooltip.tip-top-right:after {
    left: 15px;
}
/** Common styles: Vertically Centered, Left/Right arrows **/
.tooltip.tip-left:after,
.tooltip.tip-right:after {
    top: 50%;
    margin-top: -10px;
    margin-left: auto;
}
/** Right arrow **/
.tooltip.tip-left:after {
    right: -20px;
    left: auto;
    border-color: transparent transparent transparent #373739;
}
/** Left arrow **/
.tooltip.tip-right:after {
    left: -20px;
    border-color: transparent #373739 transparent transparent;
}
!

JS 

              
                // Fully accessible tooltip jQuery plugin with delegation.
// Ideal for view containers that may re-render content.
(function ($) {
  $.fn.tooltip = function () {
    this

    // Delegate to tooltip, Hide if tooltip receives mouse or is clicked (tooltip may stick if parent has focus)
      .on('mouseenter click', '.tooltip', function (e) {
        e.stopPropagation();
        $(this).removeClass('isVisible');
      })
      // Delegate to parent of tooltip, Show tooltip if parent receives mouse or focus
      .on('mouseenter focus', ':has(>.tooltip)', function (e) {
        if (!$(this).prop('disabled')) { // IE 8 fix to prevent tooltip on `disabled` elements
          $(this)
            .find('.tooltip')
            .addClass('isVisible');
        }
      })
      // Delegate to parent of tooltip, Hide tooltip if parent loses mouse or focus
      .on('mouseleave blur keydown', ':has(>.tooltip)', function (e) {
        if (e.type === 'keydown') {
          if(e.which === 27) {
            $(this)
              .find('.tooltip')
              .removeClass('isVisible');
          }
        } else {
          $(this)
            .find('.tooltip')
            .removeClass('isVisible');
        }
      });
    return this;
  };
}(jQuery));

// Bind event listener to container element
$('.namespace').tooltip();
!
999px

Console