I like using Readability.js as a demo for my shot-scraper CLI utility: https://shot-scraper.datasette.io/en/stable/javascript.html#...

Running this in a terminal (after installing shot-scraper):

    shot-scraper javascript \
      https://simonwillison.net/2022/Mar/14/scraping-web-pages-shot-scraper/ "
    async () => {
      const readability = await import('https://cdn.skypack.dev/@mozilla/readability');
      return (new readability.Readability(document)).parse();
    }"

Outputs this:

    {
        "title": "Scraping web pages from the command line with shot-scraper",
        "byline": null,
        "dir": null,
        "lang": "en-gb",
        "content": "... long string of HTML ...",
        "length": 7104,
        "excerpt": "I\u2019ve added a powerful new capability to my shot-scraper command line browser automation tool: you can now use it to load a web page in a headless browser, execute JavaScript \u2026",
        "siteName": null,
        "publishedTime": null
    }