The following table gives an overview on available placeholders in Scroll Exporters and what they can be used for:

$renderstartIs true if the opening HTML tag should be created, and false when the respective closing tag should be created 
$idAttributeOutputs an id="..." attribute only if the element has an ID 

Prints out a class="..." attribute only if there is actually a class, that means it prevents empty class attributes

The actual classes depend on the table that's being exported. Adding ".with($" ensures that custom "table styles" as set by the scroll-tablelayout macro are also propagated as a CSS class to the resulting <table> HTML element.

$cssClassesCan be used to compare classes#if ($cssClasses.contains("some-class")) ... #end