HTML-Editor with instant preview rendering
Try it: https://xernisfy.github.io/HTML-Editor
advantages:
- works offline
 - small size (only a few KB)
 - fast
 - in your browser
 - multiple documents (html, js, css)
 - moveble and resizable editor window
 
functions:
- renders as you type
 - indentation with tabulator (tab)
 
in development:
- saving
 
known errors:
- no RAM allocation limit (be careful with your infinite loops!)