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Setting in-page HTML anchors

W3C syntax rules for the destinations of in-page jump links are thus:

HTML tag id and name tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods ("."). [W3C source reference]

This means that the most obvious built-in solution for a unique ID for an object, that of using $ID, is not valid as it is all digits. Likely most browsers will cope, but it is building on sand.

Another possible source is a user attribute of the Number type using the 'sequential' option, though note such attributes are not intrinsic.

If using either of the above, a simple workaround is to simply put a letter prefix before the numerical value. For instance:

id="x^value($ID)^" 

A separate design issue is to ensure the calling link is able to use the desired destination anchor value. As the user has no control over links generated via ^text^, it can mean explicitly setting the $HTMLExportFileName for all notes so as to seed the href path of calling links so these can be post-processed to the desired version.