The mark element (<mark>) is used to highlight some parts of text of a document to indicate its importance to the users. It also draws extra attention of users to the highlighted text.
Important point need to be remembered:
HTML5 mark element is supported by latest versions of all web browsers. Internet Explorer 8 or earlier versions of Internet Explorer do not support mark tag.
There is a HTML5 mark element example given below:
<h1>About <mark>HTML5</mark></h1> <p><mark>HTML5</mark> is the fifth version of HyperText Markup Language. Many elements like header, footer, audio, video etc. have been introduced in <mark>HTML5</mark>.</p>