csfieldguide/static/interactives/checksum-calculator-gtin-13/README.md
# Checksum Calculator GTIN-13 Interactive
**Original Author:** Jack Morgan
This interactive provides the checksum digit for GTIN-13 codes. The number can be typed in with spaces.
## Required Files
The interactive loads from a base website template which includes a JavaScript file containing jQuery, Bootstrap, and a few other utilities and polyfills.
See `static/js/website.js` for a full list.