There are people who are testing the site, in terms of design, I want to know what they are guided by in their work?

Question

Software testing

What are they called, what can you read by what keywords to search for material on this topic.

Answer 1

https://www.artlebedev.ru/kovodstvo/business-lynch...
read, especially Bystronovskiy

Answer 2

In regards to design?
The easiest way to check for layout compliance is with the "Pixel Perfect" browser extension.
In addition to layout cases, you can carry out:

• Cross browser testing. See how the layout behaves on different browsers. You can do it clumsily (on multiple browsers in one-by-one mode), or you can use the "Browser Sync" utility.
  
• Mobile testing (if responsive is provided).
  
• Check the uniformity of the interface. The interface of the product must be uniform. This is not only beautiful, but also improves orientation, intuitiveness.
  
• Test input formatting rules. How they handle too long values, how hints are displayed...
  
• Check the usability of the product. Conduct a basic usability check. For example: the developer has hung a lot of trendy animations and is proud of it; and the client has to wait until the necessary elements float beautifully from behind the screen. The effect of this gap is enhanced by repeated access to the elements.
  
• Check product accessibility. This is a test of the perception of the product by people with disabilities. Well, this is an option for those who have absolutely nothing to do or simply have too much money. Tested with various browser add-ons.