Developer's Homemade Language Playground Evolves Into a Full Web App Builder

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A software developer building a custom programming language called Seseragi found that its browser-based playground gradually grew beyond a simple compiler test into a functional web application environment. The playground now supports DOM manipulation, event handling, reactive signals, and form interactions, allowing users to build interactive UIs directly in the custom language. It includes two learning sections — Tour, which walks through features sequentially, and Discover, which lets users jump to specific examples. The developer noted that writing actual code in the language exposed syntax issues that a specification document had concealed. In an ironic turn, the author now occasionally uses their own Tour to recall how features of their own language work.

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