I see that JSP pages have .jsp/.jspf/.jspx suffixes (from JavaServer Pages™ Specification Version2.2), Velocity templates uses .vm suffix, FreeMarker uses .ftl suffix.
What is recommended file suffix for Thymeleaf templates according to official body/docs/IDE expectation?
.html suffix can mislead with pure HTML 5 files. For that reason I think about putting all Thymleaf templates into thy/ hierarchy and pure HTML files keep inside html/ directory.