Select the 4 first <tr> elements:
The :lt() selector selects elements with an index number less than a specified number.
The index numbers start at 0.
This is mostly used together with another selector to select the first elements in a group (like in the example above).
Tip: Use the :gt selector to select elements index numbers greater than the specified number.
|index||Required. Specifies which element to select.
Elements with an index lesser than the specified number is selected.