display: none
<nav>
<ul>
<li>American League
<ul>
<li id="ale">East
<ul>
<li>Baltimore
</li>
<li>Boston
</li>
<li>New York
</li>
<li>Toronto
</li>
<li>Tampa Bay
</li> </ul>
</li>
<li id="alc">Central
<ul>
<li>Chicago
</li>
<li>Cleveland
</li>
<li>Detroit
</li>
<li>Kansas City
</li>
<li>Minnesota
</li> </ul>
</li>
<li id="alw">West
<ul>
<li>Houston
</li>
<li>Los Angeles
</li>
<li>Oakland
</li>
<li>Texas
</li>
<li>Seattle
</li> </ul>
</li> </ul>
</li> </ul> </nav>
In style
element
(<style>
) within head
element:
#ale ul { display: none; }
#alw ul { display: none; }
Full list for the American League: