Kill all style and link rel stylesheet in webpage from browser

kill-css-browser.js

(() => {
  let count = 0;

  const removeInRoot = root => {
    const styles = root.querySelectorAll('style');
    styles.forEach(s => s.remove());
    count += styles.length;

    const stylesLinks = root.querySelectorAll('link[rel="stylesheet"]');
    stylesLinks.forEach(s => s.remove());
    count += stylesLinks.length;

    // Parcourt les Shadow DOM
    const withShadow = root.querySelectorAll('*');
    withShadow.forEach(el => {
      if (el.shadowRoot) removeInRoot(el.shadowRoot);
    });
  };

  // Page principale
  removeInRoot(document);

  // Iframes même origine
  document.querySelectorAll('iframe').forEach(ifr => {
    try {
      if (ifr.contentDocument) removeInRoot(ifr.contentDocument);
    } catch (_) { /* cross-origin, on ignore */ }
  });

  console.log(`Supprimé ${count} <style>`);
})();