Add ex. on allowing cross-origin resource timing

Provide example on how to set the `Timing-Allow-Origin` header
in order to allow cross-origin access to the timing information
for different resources.

Ref: http://www.w3.org/TR/resource-timing/

CHANGELOG.md

@@ -1,6 +1,8 @@
 ### HEAD
 
-* Add configs for files marked as `text/javascript`.
+* Add example on how to allow cross-origin access to the resource's
+  timing information.
+* Add configs for files marked as `text/javascript`
   [[db69327](https://github.com/h5bp/server-configs-apache/commit/db6932740a90a36cbbf8b38627fc034d595471c0)].
 * Add configs for JSON Schema files (`.json`)
   [[#39](https://github.com/h5bp/server-configs-apache/issues/39)].

dist/.htaccess

@@ -10,7 +10,7 @@
 # ##############################################################################
 
 # ------------------------------------------------------------------------------
-# | Cross-domain requests                                                      |
+# | Cross-origin requests                                                      |
 # ------------------------------------------------------------------------------
 
 # Allow cross-origin requests.
@@ -33,6 +33,22 @@
     </FilesMatch>
 </IfModule>
 
+# ------------------------------------------------------------------------------
+# | Cross-origin resource timing                                               |
+# ------------------------------------------------------------------------------
+
+# Allow cross-origin access to the timing information for all resources.
+
+# If a resource isn't served with a `Timing-Allow-Origin` header that would
+# allow its timing information to be shared with the current document, some of
+# the attributes of the `PerformanceResourceTiming` object will be set to zero.
+
+# http://www.w3.org/TR/resource-timing/
+
+# <IfModule mod_headers.c>
+#     Header set Timing-Allow-Origin: "*"
+# </IfModule>
+
 # ------------------------------------------------------------------------------
 # | CORS-enabled images                                                        |
 # ------------------------------------------------------------------------------

test/fixtures/.htaccess

@@ -6,7 +6,7 @@
 # ##############################################################################
 
 # ------------------------------------------------------------------------------
-# | Cross-domain requests                                                      |
+# | Cross-origin requests                                                      |
 # ------------------------------------------------------------------------------
 
 <IfModule mod_headers.c>