Resolve "Add HTML display methods for objects"

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• Closes issue #142 (closed)
• Added tests for change code
• Updated documentation for changed code
• Documentation .rst files is written using semantic newlines
• User visible changes (including notable bug fixes and possible deprecations) are documented in CHANGELOG.rst
• Passes in this order
  • isort .
  • black .
  • blackdoc .
  • mypy .
  • flake8 .

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