Example

Code highlighting with code editor

Code editor with highlighting HTML

Code editor with highlighting HTML

Excerpt of TCA definition (EXT:my_extension/Configuration/TCA/tx_myextension_domain_model_mytable.php)
[
    'columns' => [
        'codeeditor1' => [
            'label' => 'codeEditor_1 format=html, rows=7',
            'description' => 'field description',
            'config' => [
                'type' => 'text',
                'renderType' => 'codeEditor',
                'format' => 'html',
                'rows' => 7,
            ],
        ],
    ],
]