A search box above the Contents list filters TOC entries by each
linked section's full text content (not just the link title), so
e.g. searching "european" surfaces "Slash Commands" via its command
history date-format note. Pure vanilla JS/CSS, no dependencies --
the page is a static file opened directly in the default browser.
Tested interactively in Safari Technology Preview: filtering,
no-results state, reset, and click-through navigation all verified
working, in both the matched and empty-query cases.
rune
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