how to add span error tag in html code example

Example 1: html span

A <span> element used to color a part of a text:
  
<span style="font-size:30px">&#9776; </span> 
<!-- &#9776 is a color value -->

Example 2: javascript span style

//an example of an "out of context" way to change color of a text:
<span style="color: green"></span>