HTML tree with a single line of CSS 
       ====================================
       
       
       Interactive demo 
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       - one.xcf 
       - two.xcf 
       - one.jpg 
       - two.jpg 
       - three.jpg 
       - four.jpg 
       
       The Code 
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       - HTML  -
       
       
       The details can have an attribute name to group them. Then only one is expanded at a time. 
       
       - CSS  -
       
       
       Très simple! 
       
 (DIR) previous TIL verbose console logging
       
 (DIR) next TIL executing commands in Windows explorer
       
       
       Related 
       --------
       
 (DIR) Faddy webserver
 (TXT) /img/fallback.svg (.svg) 
 (DIR) Colossus PoC
 (IMG) screenshot of colossus visualiser and malfunction controller (.png)