Lets say that i have a list like this:

<div class='my-awesome-list'>
<div class='a-list-item'>yay im a list item</div>
<div class='a-list-item'>yay im a list item</div>
<div class='a-list-item'>yay im a list item</div>
<div class='a-list-item'>yay im a list item</div>
<div class='a-list-item'>yay im a list item</div>
<div class='a-list-item'>yay im a list item</div>
<div class='a-list-item'>yay im a list item</div>
</div>

And we cant edit the actual html for some reason... but we want to only show the 1st two items in the list.

Well css can fix this for you by using the following.

<style>
.my-awesome-list .a-list-item:nth-child(n+3) {
display:none;
}
</style>

we can also apply this to an ordered or un-ordered list like so:

<ol class='my-awesome-list'>
<li class='a-list-item'>yay im an ordered list item</li>
<li class='a-list-item'>yay im an ordered list item</li>
<li class='a-list-item'>yay im an ordered list item</li>
<li class='a-list-item'>yay im an ordered list item</li>
<li class='a-list-item'>yay im an ordered list item</li>
<li class='a-list-item'>yay im an ordered list item</li>
<li class='a-list-item'>yay im an ordered list item</li>
<li class='a-list-item'>yay im an ordered list item</li>
</ol>

which will take on the same as the div version as the class names are the same.