Internal CSS style for pseudo classes?

HTML & CSS
1

We have the following problem with Google Sites. Only internal style directives can be given.

What is the internal equivalent of the following that can be seen in an external style sheet file?

tr:nth-child(even) {
background-color: limegreen;
}

See JavaScript or CSS in Google Sites.

2

It’s currently impossible. Inline styles only read properties and their values.

3