x
<html><style>.tooltip { position: relative; display: inline-block; border-bottom: 1px dotted black;}.tooltip .tooltiptext { visibility: hidden; width: 120px; background-color: black; color: #fff; text-align: center; border-radius: 6px; padding: 5px 0; position: absolute; z-index: 1; bottom: 100%; left: 50%; margin-left: -60px; /* Fade in tooltip - takes 1 second to go from 0% to 100% opac: */ opacity: 0; transition: opacity 1s;}.tooltip:hover .tooltiptext { visibility: visible; opacity: 1;}</style><body style="text-align:center;"><h2>Fade In Tooltip on Hover</h2><p>When you move the mouse over the text below, the tooltip text will fade in and take 1 second to go from completely invisible to visible.</p><div class="tooltip">Hover over me <span class="tooltiptext">Tooltip text</span></div></body></html>