It is a WYSIWYG editor for structured documents. This includes texts with hierarchical or semantically meaningful structure, lists, plaintext islands and tables, and headers. HTML-NOTEPAD does not function as a "webpage editor". It is not a "web page editor". You shouldn't expect to create "cool webpages" with it. WYSIWYG Web design with modern CSS is impossible. Because CSS is a natural language, web pages can only be created manually by editing CSS. HTML-NOTEPAD is still useful for web designers, in cases where we need to create textual (yet structured) content for our pages. HTML-NOTEPAD uses Sciter Engine to create its UI. It is small and fast, has no external dependencies, and works on all major desktop operating system, including Windows (XP to 10), Mac OS, Linux, and Linux. While WYSIWYG editing is limited, there are some operations that are much easier to perform in source code representation. HTML-NOTEPAD supports "pass through selection".