hugo/docs/content/en/functions/path/Ext.md

title, description, categories, keywords, params, aliases

title	description	categories	keywords	params	aliases
path.Ext	Replaces path separators with slashes (`/`) and returns the file name extension of the given path.			functions_and_methods aliases returnType signatures string path.Ext PATH	/functions/path.ext

The extension is the suffix beginning at the final dot in the final slash-separated element of path; it is empty if there is no dot.

{{ path.Ext "a/b/c/news.html" }} → .html