Allow me to start the question with clearer formulation and code again. 
To @JSWolf 
 Now we speak about an general coding question!
Files Browser Title A & Title B are chapters with headers in <h2> tags. Each chapter includes one 
second title Aa and one 
subtitle SubtitleAa (respective Bb & SubtitleBb) in <h2> resp. <h3> tags.
Chapter Title A would look like:
	Code:
	<body>
  <h2 id="auto1Gen1Code1">Title A</h2> 
  <p>Introducing text</p>
  <h2 id="auto2Gen2Code2">Aa</h2>
  <p>Some text</p>
  <h3 id="auto3Gen3Code3">SubtitleAa</h3>
  <p>More text</p>
  <h2 id="auto4Gen4Code4">End</h2>  
  <p>Closing phrase</p>
<body>
 Question: In ereader: How I jump back from header Aa or SubtitleAa to
a) Content or
b) to the respective entry there?
(We don't speak about the auto-generated ToC.)
	Quote:
	
	
		
			
				
					Originally Posted by  Turtle91
					 
				 
				
			
		 | 
	
	
 To allow for all possibilities:  <hx id=...> instead of <a id=...> !
	Quote:
	
	
		
			
				
					Originally Posted by  DaleDe
					 
				 
				... while the id generated inside the href statement was probably generated to allow for a return link to allow you to return after the jump. 
			
		 | 
	
	
  Exactly!
I think now I have expressed myself clearly.