How can I get a list of all the foreign key constraints I will need to remove in order to drop the table?

How can I use .getElementsByTagName so that I can search for tags inside of other tags?

Martinez

Say I have this:

       <li>
          <span>substring1</span>
          <span>substring2</span>
        </li>

How can I use getElementsByTagName to then search inside of <li> and then inside of <span> to find my keyword? Do I have to search twice? How can this be done?