First sentence of the Wikipedia article for Node.js:

> Node.js is a cross-platform, open-source JavaScript runtime environment that can run on Windows, Linux, Unix, macOS, and more.

First sentence for the Wikipedia article Deno:

> Deno is a runtime for JavaScript, TypeScript, and WebAssembly that is based on the V8 JavaScript engine and the Rust programming language.

First line of hero text from Node.js's site:

> Node.js® is a free, open-source, cross-platform JavaScript runtime environment that lets developers create servers, web apps, command line tools and scripts.

First line of hero text from Deno's site:

> Deno is the open-source JavaScript runtime for the modern web.