This isn't just for dictionaries, thanks to it's 27kb jbig2 to PNG image module it can display monochrome page scans. A jbig2 image can be as small as 12kb and still be legible for sheet music in Khmer Script.

I have a sheet music app built with this at https://peakslab.org/khmermusic/

It's stupid simple to setup, just put media files (webp, webm opus, jbig2) in a folder and run ./peakgen mediafolder/ outfile.slab Then just edit the config.js to include that outfile.slab and you've got a pwa.