This is a proof-of-concept for reading tabix-indexed files in a web browser using only javascript.
Tabix files are used to store tab-separated data in a compressed format while still making it easy and quick to pull out records by an indexed "position". (Heng Li 2011)
This demo reads both the bgzipped data file and the tabix index to extract rows in a particular range. All file access happens locally (no server involved).