Heatmap

• 2020-09-03Added [pla]
• 2020-11-30Use now a link tag instead of div, some other semantic improvements and title-attributes (markup) [jr]
• 2022-10-06Refactor markup (markup) [jr]
• 2024-05-02Add variant (markup) [jr]

• Heatmap
• Heatmap background and other text elements