Numberings go into separate blocks

[kvistgaard]

This happens with W3C spec, which to my knowledge are one of the best-formated HTML documents.

Here's an example:

SHACL Test Suite and Implementation Report

- <h2>Implementation Reports</h2>
    - This section summarizes the outcomes of test reports for submitted SHACL implementations.
- <h3>3.1</h3>
- <h3>Corese SHACL</h3>
    - Homepage:
    - http://wimmics.inria.fr/corese
    - Tests Updated:
    - 2017-05-04
- <h3>3.2</h3>
- <h3>dotNetRDF</h3>
    - Homepage:
    - https://github.com/dotnetrdf/dotnetrdf/pull/236 and http://langsamu.net/shacl
    - Tests Updated:
    - 2019-07-01
- <h3>3.3</h3>
- <h3>Netage SHACL Engine</h3>
    - Homepage:
    - http://www.netage.nl/
    - Tests Updated:
    - 2017-05-23
- <h3>3.4</h3>
- <h3>pySHACL</h3>
    - Homepage:
    - https://github.com/RDFLib/pySHACL
    - Tests Updated:
    - 2018-09-24
- <h3>3.5</h3>
- <h3>RDFUnit</h3>
    - Homepage:
    - http://aksw.org/projects/RDFUnit
    - Tests Updated:
    - 2017-10-18
- <h3>3.6</h3>
- <h3>shaclex</h3>
    - Homepage:
    - https://github.com/labra/shaclex
    - Tests Updated:
    - 2018-08-11
- <h3>3.7</h3>
- <h3>TopBraid SHACL API</h3>
    - Homepage:
    - https://github.com/TopQuadrant/shacl
    - Tests Updated:
    - 2017-10-24