Semantic <mark>
The mark <mark> element represents a run of text in one document marked or highlighted for reference purposes, due to its relevance in another context.
Basically, it is used to bring the reader's attention to a part of the text that might not have been considered important or overlooked.
In the sentence above, I have highlighted "a part of the text" because I think that is a very important point that you must not overlook.
To mark part of the text, simply put your text in between <mark></mark>. It is that easy.
Basically, it is used to bring the reader's
attention to <mark>a part of the text</mark> that might not have been considered important
or overlooked.
As of writing, not every web browser renders <mark></mark> as highlighted text, to be on the safe side, it is also good you style the mark element in CSS.
mark {
background-color:#ff9;
color:#000;
font-style:normal;
font-weight:bold;
}