Thanks for the comment, Macropod.

The epub_blockquote style is just holding some incidental attributes such as being in a 10 pt font and being aligned left rather than justified. It doesn't have any attributes relating to paragaph left and right indent.

And if I right click on one of my nice-looking transfromed-from-HTML-blockquote-into-Word-extended-quote paragraphs and select Styles and say "Update epub_blockquote to Match Selection," nothing at all happens to the epub_blockquote style.

The issue is that when Word loads an HTML file that has the blockquote tag in it, the blockquoted-paragraph has the proper-looking indent, but there is no place where I can see HOW Word is putting this format onto the paragraph.

I have my Display set to Show All Formatting Marks, so there's not a sneaky text box or something.

I wish there was a way to see the underlying "source code" of a Word file!