Challenge 3 — Solution

Task: Explain, using this chapter's own comparison table, why kanji
pages have no PDF at all while every programming lesson gets one —
what's the underlying reasoning, not just the fact itself?

The underlying reasoning comes down to whether a static, printed page
can actually preserve what makes the content useful in the first
place.

A kanji page's own core feature is a live stroke-order animation (K1)
- something that only exists and only works within an actual running
web page with real interactivity. A PDF is fundamentally a static
snapshot; there is no equivalent of "press play on this stroke
animation" once the content has been flattened onto a printed or
print-styled page. Generating a PDF version of a kanji page would
therefore either have to drop the one feature the page is actually
built around, or fake a poor, non-interactive substitute for it -
neither of which adds real value, which is exactly why K2 explicitly
states no PDF is generated for this content type at all.

A programming lesson, by contrast, has no equivalent problem: its
value is entirely in its written content - explanations, code
examples, a quick-reference table, worked exercises - none of which
depends on the page being interactive to remain useful. All of that
reads perfectly well as a static, printed document, which is exactly
why P8/PL1-3 lessons DO get a PDF (and, per PL3, so does their
companion exercise chapter) - there's nothing lost in translation from
a live web page to a flattened one.

Notes:
- This is the same reasoning K2 itself already gives for kanji pages -
  "individual kanji pages are interactive and don't translate well to
  a static PDF" - the comparison table in this chapter just makes the
  same point concrete by placing it directly against a content type
  where the opposite is true.
- The chapter also notes Links and My Tools pages share this same "no
  PDF" treatment as kanji pages, for a related but distinct reason -
  they're link-reference or working-software content respectively,
  not reading material meant to be printed at all.