monolith

A data hoarder's dream come true: bundle any web page into a single
HTML file. You can finally replace that gazillion of open tabs with
a gazillion of .html files stored somewhere on your precious little
drive.
Unlike conventional "Save page as…", monolith not only saves the
target document, it embeds CSS, image, and JavaScript assets all
at once, producing a single HTML5 document that is a joy to store
and share.
If compared to saving websites with wget -mpk, monolith embeds
all assets as data URLs and therefore displays the saved page
exactly the same, being completely separated from the Internet.

Usage

monolith https://lyrics.github.io/db/P/Portishead/Dummy/Roads/ -o portishead-roads-lyrics.html

cat index.html | monolith -aIiFfcMv -b https://original.site/ - > result.html