Trying to print https://nihongoichiban.com/2011/04/10/complete-list-of-kanji-for-jlpt-n5/ results in 10 pages, where 9 pages are blank except for header and footer.

The priority flag is not set for this bug.
:jwatt, could you have a look please?

For more information, please visit auto_nag documentation.

Here's a reduced testcase. The key features seem to be: two nested overflow:hidden divs, with a float inside of it, with tall content inside of that.

The tall content is truncated at the bottom of the first page.

So the reason we get the current bogus result is that overflow:hidden
are block-formatting contexts (BFC) and in paginated mode they are
implemented as block frames with NS_BLOCK_CLIP_PAGINATED_OVERFLOW
to do the clipping. When we have a child float that doesn't fit,
we split it and currently we report that as Overflow-Incomplete
(which is correct for a normal block, but not a BFC) which leads
to creating an overflow-container continuation which has zero
size which we then clip. We should report it as Incomplete
instead, except if we already are an overflow-container.

https://hg.mozilla.org/integration/autoland/rev/c586880d394478161f6744104d0cfb5469afb921

https://hg.mozilla.org/mozilla-central/rev/c586880d3944