// Invalidate caches of articles which include this page.
// Only for the main slot, because only the main slot is transcluded.
// TODO: MCR: not true for TemplateStyles! [SlotHandler]
// Invalidate caches of articles which include this page.
// Only for the main slot, because only the main slot is transcluded.
// TODO: MCR: not true for TemplateStyles! [SlotHandler]