I have slightly updated the notebook attached to my first post.

It now contains two Sections with an explicitly included autonumbering object at the start of each. These both export properly to HTML.

In the second Section there is also a Section cell which has a reference autonumbering object which points to the first Section cell (which has a CellTag for this purpose). It works correctly in the notebook--it displays the number 1 -- but when exported as HTML it displays incorrectly: it displays as 3.

This is a picture of the new notebook:

Thank you Hans. I did report this as a bug to WRI and it is in their bugs database. So perhaps it will get handled at some point. I don't imagine that this is avery high priority bug though... so we'll see.

David: The Wolfram Language Export HTML with MathML will produce an Automatic CSS file in the "HTMLFiles"directory. Since the file you are exporting is called "test.html" the CSS file created will be called "test.css". With the setting you currently have you then just need to modify the CSS file in the following way to go off the "DisplayFormulaNumbered" class generated in the p element MathML wrapper:

<p class="DisplayFormulaNumbered">

1. In the CSS file after html rule add a body rule to reset the counter variable we'll call equation

html { font-size: 12px; padding: 8px; } body { counter-reset: equation; }

1. Find the .DisplayFormulaNumbered rule and add the following rule

   .DisplayFormulaNumbered { font-size: 14px; font-family: Arial; color: #333333; margin-left: 66px; padding: 8px; } /* equation counter */
   p.DisplayFormulaNumbered:after { content: "(" counter(equation) ")"; counter-increment: equation; font-size: 14px; font-family: Arial; color: #333333; display: block; float: right; margin-right: 10px; }

Depending on web browser this should work.