I am using Ubuntu LibreOffice Writer as input for calibre. I have noticed that pictures do not break. If there is enough room, text appears above and below a picture on an epub page. If there is not enough room on the first page, then the picture appears at the top of the second page. I would like to have the same functionality for frames. Writer has a formatting feature which lets you checkmark for nonbreaking paragraphs. There is also orphan and widow control. These orphans, widows, and nonbreaking paragraph formatting aids only work for the printed page and are not carried over as functioning commands into calibre. I would like to see the following code added if those Writer boxed are checked:
<div class="nobreak">
</div>
.nobreak {
page-break-inside: avoid;
}