{{#discriminator.mappedModels}} {{#-first}} {{#vendorExtensions.x-useDeduction}} @JsonTypeInfo(use = JsonTypeInfo.Id.DEDUCTION) {{/vendorExtensions.x-useDeduction}} {{^vendorExtensions.x-useDeduction}}

In Rails, this is known as nested layouts, and it is a bit awkward to use. The standard Rails practice for nested layouts is complicated and involves these considerations:

having inconsistencies when all the "subtle" conditions were met is unfriendly. it requires the user to have much deeper understanding of the nuances of the language.

This is just one of those things in CSS that seems easy to understand (and really, it should be), but it’s sometimes not — because of the way that percentages work in CSS.

Any updates on this one? It makes debugging JS and CSS in the web inspector next to impossible when you can't get any help finding the offending code in your own source files.