Auto-number table rows?

Answer 1

Here is a modification of David Thomas' CSS solution that works with or without a header row in the table. It increments the counter on the first td cell of each row (thereby skipping the row with only th cells):

table
{
    counter-reset: rowNumber;
}

table tr > td:first-child
{
    counter-increment: rowNumber;
}

table tr td:first-child::before
{
    content: counter(rowNumber);
    min-width: 1em;
    margin-right: 0.5em;
}

You can see the behavior in this jsfiddle.