Knowledge Base

What are Core Web Vitals? LCP, INP and CLS explained

Core Web Vitals measure loading speed, responsiveness and visual stability. Learn what LCP, INP and CLS mean and which values score well.

Digital accessibility: what your website must comply with

What digital accessibility means, who is legally required to comply (EAA and government) and how to check whether your website measures up.

Testing website speed: how to measure load time properly

Test your website speed with lab and field data. Learn which tools to use, which values matter and how to make a slow site faster.

Mobile-friendly website: what does your site need to get right?

A mobile-friendly website works well on every screen. Read where it goes wrong in practice, what Google expects and how to test your own site.

SSL certificate: why your website needs HTTPS

An SSL certificate encrypts traffic between visitor and website. Read how HTTPS works, which certificate types exist and how to check your site.

Security headers: which ones does your website need?

Security headers protect visitors against eavesdropping, XSS and clickjacking. Find out which headers you need and how to set them up safely.

What is WCAG? The guidelines for an accessible website

WCAG explained: the four principles, levels A, AA and AAA, the difference between 2.1 and 2.2 and how to test your website against the guidelines.