Most web app systems model applications as a collection of pages. Information must be persisted between pages in some sort of datastore. Sometimes this is in memory but oftentimes it is done in a database or by passing files. Run BASIC does not force you to partition your applications in this way. Instead you can write your entire application as a single continuous program just like you would write a desktop app. You create a new page in your application by clearing the page and placing new things onto it in a dynamic way.
Traditionalist procedural programmers can create entire applications using subroutines and functions, similar to how it is done in popular languages like QBasic. This democratizes web programming because many casual programmers are comfortable with this way of coding software.
More object-oriented thinkers can componentize their systems into objects and call methods on them. The objects can be purely data, or they can render into a display buffer and be injected into a web page. This makes it easy to have different parts of a web page managed in a modular way.