Presentation for LangDev 2023, 14+15 november 2023 in Utrecht. https://langdevcon.org/ The basic idea of “Projectional Forms” is very simple: use HTML form elements instead of text in an editor to get information into an AST. Text input boxes, dropdown select boxes, check boxes, radio buttons etc. From the early days of the World Wide Web on, form elements were the way to interact with an HTML page. In modern web-applications form elements are still widely used to gather user input. Forms have evolved and many packages and frameworks offer more elaborate possibilities out of the box, built on top of the same old basic form tags: custom fields, (repeating) sub-forms, form validation, easy creation, JSON output etc. The possibilities are endless. An important advantage of the use of form elements in online applications is: people are used to them and don't have to learn something new. It is easier to use than a text based editor. I will demo the use of projectional forms on the hand of the “Extension Generator” I'm working on at the moment. First presentation was on Dutch JoomlaDays in May (which were at the same time as the MPS Community Meetup this year). It uses forms on the M1-level to create complete and working online applications, like e-commerce or a booking system. It was based on earlier work in Xtext that was later ported to MPS. In this Extension Generator the AST is filled (online) using HTML form elements, that were static, predefined. The applications are mainly generated from the AST using templates. This summer I've been working on the M2-level: making forms that dynamically define forms. This is in fact defining DSLs! This definition of forms is again done using HTML form elements, online. I've used LionWeb as the basic structure on the M3-level and am now working on import and export from and to the LionWeb Serialization Format. Next step will be to define generators using a “forms-language” (beside the use of templates). Main inspiration for this part are MPS' model-to-model transformations. Although still work in progress, I can demo the concept of Projectional Forms with this practical Extension Generator and show the limitless possibilities of simple HTML form elements as a medium for projectional editing and language definition. In many cases it can be an interesting alternative for traditional code in text format.