Yes, i was thinking about table borders when i posted the above. The other day i posted a table on my website, and i had to write border="1" in the post itself, to get borders. Which got me thinking:
The h3 tag for each post presently contains an id attribute with the post's ID number in the database. Now, if the div "meta" and the div "storycontent" for each post also contained that same post ID, as the admin i could create a CSS file, with the same title attribute as my "preferred" CSS in the link rel that calls it from my page's header section, and in that CSS file put the IDs of the particular posts i want to influence.
Then the qustion would remain as to how other authors (and which, depending on their level) would do the same - add formatting for their post in CSS syntax to an appended CSS file. Maybe an editor for posts' formatting.
That might be a step towards making WP sites validate as Strict.