The HTML5 <var> tag is used to be able to incorporate a variable within an HTML document. It is applicable for adding a portion of an application, a specific mathematical expression/sentence or it could also serve as a placeholder in prose.

The HTML5 <var> tag is recognized by the primary web browsers like Internet Explorer, Google Chrome, Safari, Opera and Firefox. Using the HTML5 <var> tag is not a problem too since it is compatible with both the Global Attributes and Event Attributes in HTML5.