The Simple Tab Indent plugin redefines how the Tab key behaves by inserting a zero-width space followed by a real tab character. This workaround prevents lines from being misinterpreted as code blocks in markdown while preserving the visual indentation in the editor. It works seamlessly in both source mode and live preview, offering a smooth writing experience without markdown quirks. Users can also customise the tab rendering width through plugin settings using CSS `tab-size`, which takes effect instantly. It's a minimalist plugin with no build steps or dependencies, ideal for those who want clean, consistent indentation without unexpected formatting changes.