I've set a global page break rule for tables to avoid page breaks inside:

table { page-break-inside: avoid; }

And I have specific table, carrying a unique ID, for which I would like to allow it to break, so my stylesheet also reads:

table#some-id { page-break-inside: auto; }

However, the IDed table is not overriding the less specific page break rule, even if I add !important. This specific table is longer than a page and is preceded by a smaller table. Instead of breaking so that it fills the previous page, there is a page break before the large table, leaving lots of white space after the previous smaller table.

Never mind, false alarm! Found an error elsewhere in the stylesheet that was breaking it.