Custom layout handles in Magento

So far, we’ve been looking at the Magento_Theme module which defines the core page layouts, containers, layouts & blocks. These define the bare root of page layouts, but module’s can extend all of these aspects.

Let’s go to the Magento_Wishlist module at vendor/magento/module-wishlist. This module controls what products have been added to a customer’s wishlist. Going to view/frontend/layout, we will see many layout XML files defined.

You’ll notice a specific naming convention going on. We learned default.xml applies to all pages in Magento, but these files target either specific pa...