diff --git a/404.md b/404.md
index befb8d20a6..e9e66bd3db 100644
--- a/404.md
+++ b/404.md
@@ -6,6 +6,14 @@ notoc: true
tree: false
---
+
+
+We tried to forward you to where we think you might be going, but we couldn't
+find a good match. You've got some choices:
+
+
+
+
-
-
-
-We tried to forward you to where we think you might be going, but we couldn't
-find a good match. You've got some choices:
-
-
-
diff --git a/README.md b/README.md
index 95c373c998..ed97ec6a08 100644
--- a/README.md
+++ b/README.md
@@ -204,6 +204,12 @@ guidance about grammar, syntax, formatting, styling, language, or tone. If
something isn't clear in the guide, please submit an issue to let us know or
submit a pull request to help us improve it.
+### Testing changes and practical guidance
+
+If you want to test a style change, or if you want to see how to achieve a
+particular outcome with Markdown, Bootstrap, JQuery, or something else, have
+a look at `test.md` (which renders in the site at `/test/`).
+
### Per-page front-matter
The front-matter of a given page is in a section at the top of the Markdown
@@ -260,6 +266,17 @@ references as you rename, add, and remove tabs.
```
+For more info and a few more permutations, see `test.md`.
+
+### Running in-page Javascript
+
+If you need to run custom Javascript within a page, and it depends upon JQuery
+or Bootstrap, make sure the `