[talmand]

There's no easy solution to this. Mainly because CSS barely knows what a baseline is and there's very little in CSS that affects the baseline or something to that effect. What we call baseline can vary from font-to-font, browser-to-browser, platform-to-platform; all affecting how the font gets rendered.

Plus, based on the description and requirements of the problem it's likely to not be solved because the font-size is an unknown variable in the equation. If it was known how the font-size is determined and applied then maybe something could be leveraged to adjust for the problem.

The easy solution, knowing the font size, is to position a parent element at the coordinate and then move a child element containing the text upward an amount based on the font-size. That way the first line of text in the child element sits on the top line of the parent element, more or less. But we don't know the font-size and it is easily broken if the site is constantly being changed code-wise. In fact, a badly thought out line-height may break it as well.