klz-cables.com/test-html.js

const fs = require('fs');
const html = fs.readFileSync('.htmlvalidate-tmp/page-8.html', 'utf8');
console.log('--- MAIN TAGS ---');
const mainTags = html.match(/<main[^>]*>/g);
console.log(mainTags);

console.log('--- DUP CLASS EXAMPLES ---');
const classAttr = html.match(/class="[^"]*text-slate-500[^"]*"/g);
if (classAttr) {
  console.log(classAttr[0]);
}

const dupText10 = html.match(/class="[^"]*text-\[10px\][^"]*"/g);
if (dupText10) {
  console.log(dupText10[0]);
}