jQuery, the .mouseover() event

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .tooltip {
            position: relative;
        }

.tooltip:before {
            content: attr(data-tooltip);
            position: absolute;
            top: -30px;
            left: 0;
            background-color: #333;
            color: #fff;
            padding: 5px;
            border-radius: 5px;
            display: none;
        }

.tooltip:hover:before {
            display: block;
        }
    </style>
</head>

<p data-tooltip="This is a tooltip.">Hover over this text to see a tooltip.</p>

</html>