dragselect

<picture>
  <source media="(prefers-color-scheme: light)" srcset="https://dragselect.com/img/dragselect-logo.png">
  <source media="(prefers-color-scheme: dark)" srcset="https://dragselect.com/img/dragselect-logo-alt.png">
  <img alt="The DragSelect logo: a selection symbol, a hand, a drop symbol and a mouse within a selection square." width="300" src="https://dragselect.com/img/dragselect-logo.png">
</picture>

Project-Page | Documentation | Github | NPM

easily add a selection algorithm to your application/website.
The project page is https://dragselect.com/. And you find the documentation there.