misc trivial | exception
remove database
js tip | map
mv trivialness to digest
add book directory
css tip | animated media queries
book ljdp | singleton
linux tip | multiple ip
add sqlite tip
js tip | requestAnimationFrame
add note on tangled_web
tangle web | url & user input
digest | python list index
tangle web | http
tangled web | http header split
tangled web | html escape
tangled web | css
tangled web | js encode