According to https://survey.stackoverflow.co/2023/#section-developer-role... , about 58% of developers are web front-end, back-end, or full stack. That's probably an undercount since their survey includes non-practitioner roles such as management, students, and QA. All of those will be using more or less the same frameworks, libraries, and other software to target the same browsers, database engines, operating systems, etc. Doesn't seem like that much of a stretch to be able to write a test that evaluates proficiency in the common underlying concepts used across web software.