This is an implementation of (most of) the WICG’s Text Fragments draft specification: https://wicg.github.io/scroll-to-text-fragment/.
It implements the spec line by line, in order to help serve as a reference implementation and to help test the specification. No attempt is made to e.g. increase efficiency.
A polyfill is provided to use text fragments in browsers and other HTML viewers that do not support this feature natively.
Try it out in the playground!