Enhancement idea: Can we improve things with css attr values?

[IDisposable]

Looking at the samples <td style="--size: calc( 60 / 100 );"> $ 60K </td> might be more semantically valuable if we did something like

<td data-value="60" data-total="100" style="--size: calc( attr("data-value") / attr("data-total");"> $ 60K </td> or something similar... and we could have the default style for size be implicitly that calc and do similar for --start. Also would be cool to be able to reach up for the data-total value using the cascading of CSS ;)