Web Development covers many technologies but the three key technologies are HTML, CSS and JavaScript. If a platform supports all three then it will feel like "web development", so things like Progressive Web Apps, where web pages behave like applications. Modern browser extensions, or Web Extensions are another example that use web technologies.
A great place to get started is Learn web development | MDN or MDN Curriculum.
The area for accessibility is an important one, and the ARIA (Accessible Rich Internet Applications) link below will help with that. A good starting point is Accessibility | MDN for all things accessibility.