<mark>

The <mark> semantic HTML element represents part of a text that should be rendered as marked or highlighted, due to being particularly relevant in its specific context. It can be used to draw the reader’s attention to a specific word, phrase, or section.

Syntax

<mark>
  <!-- Mark content goes inside the tag -->
</mark>

Using the <mark> element requires an opening and closing tag that wraps around a block of text. By default, browsers will render it as a black font on a yellow background, but this can be restyled via CSS.

Example

In the example below, the <mark> element is used to highlight important words and phrases:

<p>
  <!-- Main concepts in the paragraph are in <mark> tags and will be highlighted -->
  The <mark>properties</mark> of the noble gases can be well explained by modern theories of atomic structure: Their <mark>outer shell of valence electrons</mark> is considered to be <mark>"full"</mark>, giving them little tendency to participate in chemical reactions, and it has been possible to prepare only a few hundred noble gas compounds. The melting and boiling points for a given noble gas are close together, differing by less than 10 °C (18 °F); that is, they are <mark>liquids over only a small temperature range</mark>.
</p>

The resulting markup would look like this: