Here are some examples of barcodes in CSS.
CSS Grid: Train Ticket
Dev: Olivia Ng
Cinema ticket
Dev: Kevin Lorenz
UX 8: Scan me!
Dev: Nick Perez Rivera
Receipt with result
Dev: Mariam Massadeh
CSS Flight Ticket
Dev: Lennart Hase
Pure CSS Barcode
Dev: Nick Matantsev
Electronic Boarding pass
Dev: Daniel Fontes
Animated CSS Barcode
Dev: Dayna Blackwell
RGB Text
Dev: Sean Free
Hitman Absolution Loading Screen Big Barcode
Dev: Mister Rain
CSS-Only 12-digit UPC-A Barcode Generator
Dev: Woodrow Barlow
Barcode Animation
Dev: Daniel Hwang
Barcode
Dev: Chance Squires
CSS Animation Barcode
Dev: Lexa
CSS Barcode Generator
Dev: JFarrow
CSS3 Barcode / QR Code merge made interactive
Dev: Dimitrie Hoekstra
Barcode Generator
Dev: Benjamin J DeLong
Binary barcode renderer
Dev: Ing. Jan Kaláb
Flight Ticket
Dev: Daiquiri.io