how to highlight particular text in <p> tag code example

Example 1: css text highlight

/*Term: css text highlight*/

/*This uses the element ::selection, which is as far as i
know only supported by Google Chrome so far. This is not
a problem though, since other browsers will simply keep
the regular highliting styles.*/

/*Example*/
::selection {
  background-color: #000; /*Highlight Color*/
  color: #fff; /*Text Color*/
}

Example 2: mark tag in html

mark {
  display: inline-block;
  line-height: 0em;
  padding-bottom: 0.5em;
}