angular - How to make group header in a table? - Stack Overflow
htmltools – repeatable table headers during HTML to PDF Conversion | VeryPDF Knowledge Base
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htmltools – repeatable table headers during HTML to PDF Conversion | VeryPDF Knowledge Base
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Display - Tailwind CSS
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Tables in HTML documents
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html - table-footer-group and table-header-group not taking the width of the table - Stack Overflow
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Tables
![Add support for tables with two headers in views table display [#2770835] | Drupal.org](https://www.drupal.org/files/issues/2018-04-13/views-table_format-row_header_column-title_selected.png "Add support for tables with two headers in views table display [#2770835] | Drupal.org")
Add support for tables with two headers in views table display [#2770835] | Drupal.org
Full list of CSS display property values with description - Eqsash
display: table-header-group — DataTables forums
