section ticking covers the section

CHANGELOG.md

@@ -115,6 +115,17 @@ ADR-007 and ADR-002.
 
 ### Fixed
 
+- **Ticking a section off crossed out its title and nothing else.** The strike
+  now covers everything under that heading, including its sub-sections, which
+  is what "this section is done" means to somebody who ticked the thing that
+  contained them. It needed the heading RANK, which the HTML importer was
+  discarding: every heading arrived as a sibling, so a parent had no children
+  to cross out. Headings now carry their level, render at their rank, and a
+  guide written before this reads as flat, exactly as it did. Code blocks,
+  tables and images inside a finished section are faded but not struck - a line
+  through a command makes it unreadable, and re-reading the command is usually
+  why somebody looks back at a step they have already done.
+
 - **Tech Tools was invisible to anyone without an account**, even though every
   tool on the page is deliberately usable without one and Secure Send is the
   single write this product offers a guest. The nav item named no permission,