'XSLFO: width auto vs width 100%

I am working to generate pdfs, and am using xslfo for it. So I have a table which is placed inside a block. On table I have applied a style with:

width = 100%

This sometimes cause table to stretch on sides and so its borders are not visible.

So I tried to replace it with:

width=auto

This causes some tables to shrink and they don't occupy full width of containing block.

How actually these things work? What should be my settings so that inner table fits the containing block?

pdf xsl-fo

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