Why it matters
People using screen readers can't use pages without these basics, and inaccessible sites get sued under laws like the ADA and the EU Accessibility Act. These are the cheapest fixes on the list.
How to check it yourself
View your page source: the <html> tag should have a lang attribute, there should be a real <title>, and every <img> should have an alt attribute.
What the fix involves
Add lang to your root layout, give every page a descriptive title, and write alt text for every meaningful image. Decorative images get an empty alt.
Reference: w3.org
How vibeliq checks it
We load your page the way a visitor's browser would, read what your server sends back, and look at a short list of well-known addresses on your site. If this turns up, your report explains it in plain English and gives you a prompt, written for Claude Code, Cursor, Lovable or whatever built your site, that fixes it in your actual codebase.