Challenge 3 — Solution

Task: This chapter's own code blocks all have working Copy buttons on
the live site, with zero <script> tag inside this chapter's own HTML
file. Explain why, referencing P12's own reasoning about injected
content.

The live static site injects every chapter fragment into the actual
page using a set:html-style mechanism - the equivalent of setting
innerHTML directly with this chapter's own HTML content, rather than
writing it as real, original markup that was part of the page from the
start. A well-known behavior of innerHTML-style injection across every
major browser and framework is that any <script> tag contained inside
the injected content is never executed - the browser parses it into
the DOM as an inert tag, but never actually runs the code inside it.

Because of that, P12 explicitly does NOT have each individual chapter
fragment define its own copyCodeBlock function in a local <script>
block - doing so would silently produce a Copy button that visually
exists but does nothing at all when clicked, since its own defining
script never ran. Instead, the copyCodeBlock function is defined
exactly once, globally, inside the site's own shared BaseLayout.astro
- real, original page markup that the browser DOES parse and execute
normally, since it was never injected via innerHTML in the first
place. Every chapter's own Copy button then just calls that already-
globally-available function via a plain onclick="copyCodeBlock(this)"
attribute, which works correctly regardless of which chapter fragment
it's embedded in.

Notes:
- This is exactly why this chapter's own code blocks have no <script>
  tag anywhere in the file - there was never a reason to write one,
  since the shared, actually-executing copy of the function already
  covers every chapter site-wide.
- P12 also notes this isn't retroactive - some older, already-generated
  chapters elsewhere on the site may still contain their own now-dead,
  harmless local copy of the script from before this fix was made; new
  chapters (like this one) simply don't add one at all.