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// In a browser environment, using DOMPurify (install via npm or CDN)
// npm install dompurify
import DOMPurify from 'dompurify';

function sanitizeUserInput(inputString) {
  // DOMPurify.sanitize removes dangerous HTML and attributes
  // It returns a string that is safe to insert into the DOM.
  const cleanHtml = DOMPurify.sanitize(inputString, {
    USE_PROFILES: { html: true } // Or customize allowed tags/attributes
  });
  return cleanHtml;
}

// Example usage:
const untrustedInput = "<img src=x onerror=alert('XSS!')><p>Hello <b>World</b></p>";
const trustedOutput = sanitizeUserInput(untrustedInput);

console.log("Original:", untrustedInput);
console.log("Sanitized:", trustedOutput);
// document.getElementById('output').innerHTML = trustedOutput; // Now safe to insert

// For Node.js, you'd typically sanitize before storing or sending to another service,
// often using a library like 'xss' or 'sanitize-html'.
// const xss = require('xss');
// function sanitizeForNode(input) {
//   return xss(input);
// }
// console.log("Node.js sanitized:", sanitizeForNode(untrustedInput));