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Originally Posted by FrankJH

Sorry, that was my mistake.

Here's what I meant:

<table class="DeclensionTable SmallTable">

The appearance is controlled by the first class, the size by the second ...

For my purposes, it is a satisfying solution.

Thank you very much for your help!

Yes, I use something similar. I have a "block" div that is generic for setting things off from the paragraphs:

div.block {
    margin-left: auto;
    margin-right: auto;
    margin-top: 1em;
    width: 85%;
}

Then for the specific types of blocks I have additional classes:

div.article {
    font-family: sans-serif;
}


div.letter p {
    font-style: italic;
    hyphens: none;
}

And then combine them like you're doing:

<div class="block letter">

I don't remember the details but the p after div.letter is needed because the font-style doesn't propagate to the paragraphs in a div and needs to be specified for the paragraphs within the div. Whereas the font-family does propagate down into the paragraphs within the div.