Originally Posted by cybmole
that is well put. I'd never coded footnotes myself & could not see how to compute those file pointer #filepos numbers as per the example I cut n pasted from an actual text. I'm guessing that they are added when book code is converted from some other format into epub ?. I see them also in some retail .toc
PS original kindle had a "browser" back button but what about Kindle touch ?
filepos is a computer conversion generated number. The anchor number can be ANY unique string value that does not start with a digit.
While relative anchors are legal, Sigil can not cope if yo split the file and you end up with orphan references. I suggest you always include the Full filename path in a reference, just to be solid