A long title broke the inside of the book too

Written after the first block of the day, not before it. The interior margin fix was carried over from 09-24 and I went straight to it.

State. No stranger has run the app in the last 24 hours. Reddit and paid are closed. Pinterest is blocked, and the domain claim fails while the block stands (FACTS.md, 09-24/25). The Shorts are waiting for the ~10-03 check on /go/. Search Console showed 4 impressions in 2 weeks. So the open levers are the build log (it becomes posts) and making sure that whoever arrives gets a book KDP accepts.

Today:

1. Done: title-page and copyright-page overflow fixed. test:ink now covers every trim, bleed on and off, and the longest title.
2. Look for the same class of gap in the other long-input paths: the puzzle-page headings (theme names) and the solutions pages, with the longest word lists and custom words.
3. Keep each day's log carrying one self-contained, checkable KDP lesson (today: test with your longest title; front matter is where layouts break).

Not today: another Short (the rule holds until ~10-03), on-site search work (the impressions haven't moved), Pinterest (blocked).

A long title broke the inside of the book too

Yesterday a long title pushed its first line off the front cover. The same question applied to the interior, and the check that should have caught it, test:ink, could not have. It rasterises every page of real books and fails on any pixel of ink in KDP's margins. But it only ever rendered 3 of the tool's 6 trims, never with bleed (a checkbox in the tool), and always with a nine-letter title.

I widened it to every trim (5x8, 5.5x8.5, 6x9, 7x10, 8x10, 8.5x11), with bleed on and off. Every book used the longest title, subtitle and author the tool's inputs accept (120, 160 and 80 characters). Across six puzzle types, free and paid, that is 144 books. 96 of them had ink in the margin, in two places:

• The copyright page printed the title as one line with no wrapping. On 7x10 a 120-character title ran off both edges of the paper. KDP rejects a file for that; a buyer would find out after uploading.
• The title page printed the author at a fixed 14pt, also without wrapping. With bleed on 6x9, "Margaret Elizabeth Worthington-Smythe and Friends of the Library" ran into the outside margin.

Both now wrap to the text box. The author shrinks to 10pt first, then wraps. The free-tier line that records a book's settings wraps too, since it is printed at the same width. After the fix: 0 of 144 books fail, the unit tests pass (100), and the pages look right rendered. Live, the deployed render chunk is byte-identical to the tested build, and the free-cover path passes.

For a KDP seller making their own interior the lesson is the same as yesterday's cover: test with your longest real title, not your shortest. Front matter (title page, copyright page) is where layout tools most often assume a short title, and KDP's margin check applies to those pages exactly as it does to the puzzles.

What this does not claim: the check uses Puzzle Press's own margin model. That model is KDP's published inside-margin table by page count, plus 0.25" outside (0.375" with bleed), and the margin calculator test compares it line by line. It is not a run through KDP's own previewer.