JavaScript (ES5)
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Dynamic tooltip content with HTML elements in JavaScript (ES5) Tooltip control

The Tooltip component loads HTML tags using the content template.

The HTML tags such as <div>, <span>, bold, italic, underline, etc., can be used. Style attributes can also be applied with HTML tags.

Here, Bold, Italic, Underline, and Anchor tags are used.

When using HTML elements as content to Tooltip make the content element display: none, then from the beforeRender event we can make the element visible again using below code.

    document.getElementById('content').style.display = 'block';
Source
Preview
index.js
index.html
index.css
var title = new ej.popups.Tooltip({
    cssClass: 'e-tooltip-css',
    position: 'BottomCenter',
    opensOn: 'Hover',
    beforeRender: onBeforeRender,
    content: document.getElementById('tooltip')
});
title.appendTo('#Title');

var btn = new ej.buttons.Button();
btn.appendTo('#Title');

function onBeforeRender(){
    if(document.getElementById('tooltip')) {
        document.getElementById('tooltip').style.display = 'block';
    }
}
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Tooltip</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="tooltip">
            <h2>HTML Tags</h2>
        Through templates, <b><span style="color:#e3165b">tooltip content</span></b> can be loaded with <u><i> inline HTML, images, iframe, videos, maps </i></u>. A title can be added to the content</div>
        <div id="tooltipContent">
          <div class="content">
             <button class="text" id="Title">HTML(With Title)</button>
          </div>
        </div>
      </div>



<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
#container {
    visibility: hidden;
}

#loader {
    color: #008cff;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}

#tooltipContent table {
    margin: 0 auto;
}

#tooltip {
    display: none;
}

#tooltipContent {
    display: inline-block;
    position: relative;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 100px;
}

.text {
    text-transform: capitalize;
    width: 155px;
}

.header {
    font-family: "Arial Black", Gadget, sans-serif;
    font-size: 12px;
    padding-bottom: 2px;
    margin: 4px -7px 7px -7px;
    padding-right: 5px;
    padding-left: 6px;
    font-weight: bold;
    height: 18px;
    border-bottom: 1px solid white;
}

.e-tooltip-css.e-tooltip-wrap .e-tip-content {
    padding: 0 10px 10px 10px;
}
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