TYPO3 Core

Oh, I think this suffices. I don't know about this. On wich Version works this Feature and how is it documented?

Thanks Andreas

Hehe, I use this not very often, so I needed to search firstly a bit.

And my answer wasn't correct, you can not only colorize background you can also colorize the border, you can use every possibility of CSS. ;)
The Searchword for google is "inDocStyles_TBEstyle".

In short I use it like this in the ext_tables.php of the configuration extension for the customer:

$TBE_STYLES['inDocStyles_TBEstyle'] .= 'td.t3-page-column-99 {background-color: #00A000;}';

The number 99 is the colPos number you gave the column in your backend_layout configuration.

Does this information helps you?

@Markus you always have an identifier, because this is the one that is also used to save to in the page record and to distinguish them during frontend rendering.

However it might be smarter to simply add a layout field.