It's for our own sanity.

benlk · benlk · commit 7183b00a85f6 · 2015-09-16T12:44:01.000-04:00
diff --git a/style-guides/code/html_and_css.md b/style-guides/code/html_and_css.md
@@ -2,3 +2,4 @@
 
 * Element IDs and class names should always be ``lowercase-with-dashes``.
 * Put modals and JST templates in their own files. If using our fork of the NPR app template these belong in the `templates` and `jst` directories, respectively. When this isn't feasible, put modals in the page footer first, followed by inline javascript templates.
+* Don't use negative margins.

Original file line number	Diff line number	Diff line change
`@@ -2,3 +2,4 @@`
`2`	`2`
`3`	`3`	* Element IDs and class names should always be ``lowercase-with-dashes``.
`4`	`4`	* Put modals and JST templates in their own files. If using our fork of the NPR app template these belong in the `templates` and `jst` directories, respectively. When this isn't feasible, put modals in the page footer first, followed by inline javascript templates.
	`5`	`+* Don't use negative margins.`