<select>

<optgroup label="Group 1">

<option value="option1"> Option 1 </option>

<option value="option2"> Option 2 </option>

</optgroup>

<optgroup label="Group 2">

<option value="option3"> Option 3 </option>

<option value="option4"> Option 4 </option>

</optgroup>

<optgroup label="Group 3">

<option value="option5"> Option 5 </option>

<option value="option6"> Option 6 </option>

</optgroup>

</select>





The definition of <abbr title="World Wide Web">WWW</abbr> is that it is a network of online content that is formatted in HTML.

Coding Defined Copyright 2014-<del>2015</del><ins>2016</ins>

Price of Flight Ticket reduced to <mark>$500</mark> from $750