HTML5 supports data attributes that you can use to store extra information with any DOM elements. The name of these data attributes are prefixed with data-* (lowercase) and these can be easily parsed with the HTML5 dataset API.
For instance, if you an element has data attributes as data-name="apple" and data-color="red", you can access them from JavaScript as elem.dataset.name and elem.dataset.color respectively. There’s no need to attach custom class names to attach properties to an HTML element.
The data-* attributes are supported in IE 10+ and all other browsers. Here’s a complete snippet.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>HTML5 data-* atributes</title>
</head>
<body>
<div id="person" data-name="labnol" data-country="India"></div>
<script>
var element = document.getElementById('person');
var dataset = element.dataset;
console.log(dataset.name);
console.log(dataset.country);
element.innerHTML = dataset.name + ' lives in ' + dataset.country;
</script>
</body>
</html>
