Vendor prefixes on one line?

Question

css

Is it acceptable to markup like this:

::-moz-selection, ::selection {
    background-color: tomato;
}

Or just different lines:

::-moz-selection {
    background-color: tomato;
}

::selection {
    background-color: tomato;
}

Answer 1

The browser ignores the entire group of selectors if one of them is not valid. And for chrome, for example, ::-moz-selection will not be valid, which means the properties will not be applied.