What do full-time web developers remember?

In my experience, people tend to remember high level principles and best practices, e.g. use good document structure and provide alt text on images for accessibility, minimize use of inline CSS and JS, minimize image sizes and number of HTTP requests for better performance, etc.

People don’t tend to remember the exact syntax of how to do such things, or questions like “what parameters does array.reduce() take”? For those kind of questions, you’ve got MDN :wink:

I’m very experienced with CSS, but I still find myself looking up syntax all the time, especially for more complex features like border-image and radial-gradient.