When to use .html or .html.html?

[Troy]

After reading through Hugo’s Lookup order I noticed that sometimes the ending of the templates is .html and sometimes .html.html. Is there any logic?

Example

[
layouts/posts/posts.html.html
layouts/posts/section.html.html
layouts/posts/list.html.html
layouts/posts/posts.html 
layouts/posts/section.html
layouts/posts/list.html
layouts/section/posts.html.html
layouts/section/section.html.html
layouts/section/list.html.html
layouts/section/posts.html
layouts/section/section.html
layouts/section/list.html
layouts/_default/posts.html.html
layouts/_default/section.html.html
layouts/_default/list.html.html
layouts/_default/posts.html
layouts/_default/section.html
layouts/_default/list.html
]

[pamubay]

a nice thread about how hugo template lookup order work:

Template Lookup: A Guide

Hugo’s Templates Lookup Docs ref Demo / Source Looking at the extensive list of examples in the docs might be a bit overwhelming to new Hugo users, but it is not that complicated once we break it down. Layout files are generally in the pattern: 1 2 3 4 5 6 layoutDir / [directory] / filename . [lang] . [outputformat] . suffix Let’s look at each page .Kind to see how the values of these parts are affected: home content/_index.md => …