MUM digital agency

What Dr Urls found on mum.lu

From the audit of their public home page on 25/10/2026, worst first. Each links to what it means and how it is fixed.

• medium
  Focus indicators removed or hidden

  Focus indicators are essential for keyboard navigation.

• medium
  Images missing width and height attributes

  Missing image dimensions are the leading cause of Cumulative Layout Shift (CLS), a Core Web Vital and ranking factor.

• medium
  Scripts without async or defer

  Synchronous scripts halt HTML parsing while the browser downloads and executes them.

• medium
  URL has excessive query parameters

  Excessive query parameters multiply the number of URLs search engines must crawl, wasting crawl budget.

• low
  CSS files are not minified

  Unminified CSS files are larger than necessary, increasing download time and delaying rendering.

• low
  ETag header missing on resources

  Without ETags, browsers cannot efficiently validate whether cached resources have changed.

• low
  Excessive inline CSS

  Inline CSS cannot be cached separately by the browser, so it is re-downloaded with every page load.

• low
  Excessive inline JavaScript

  Inline JavaScript cannot be cached by the browser and must be parsed and executed every time the page loads.

• low
  Images missing responsive srcset

  Without srcset, a 1200px wide image is downloaded on a 375px wide mobile screen, wasting bandwidth and slowing load times.

• low
  Images not using modern format

  WebP images are 25-35% smaller than equivalent JPEG images, and AVIF offers even greater savings.

• low
  Link is named for screen readers but has no anchor text

  Nothing is broken for users.

• low
  Open Graph og:url does not match canonical

  Mismatched og:url and canonical tags create confusion about the preferred URL.

And 2 more. 2 security findings are not listed on this public page; the site's owner sees them in a full audit after claiming it.