diff --git a/markdown.md b/markdown.md
index 981b50386..93f192a65 100644
--- a/markdown.md
+++ b/markdown.md
@@ -21,6 +21,8 @@ layout: default
     [link][google]
     [google]: http://google.com
 
+    <http://google.com>
+
 ### Images
 
     ![Image alt text](/path/to/img.jpg)
@@ -53,3 +55,38 @@ layout: default
 
     ----
     ****
+
+Kramdown extensions
+-------------------
+
+### Footnotes (Kramdown)
+
+    This is some text.[^1]. Other text.[^footnote].
+
+    [^1]: Some *crazy* footnote definition.
+
+### Abbreviations (Kramdown)
+
+    This is some text not written in HTML but in another language!
+
+    *[another language]: It's called Markdown
+    *[HTML]: HyperTextMarkupLanguage
+
+### Classes and IDs (Kramdown)
+
+    A simple paragraph with an ID attribute.
+    {: #para-one}
+
+    > A blockquote with a title
+    {:title="The blockquote title"}
+    {: #myid}
+
+    * {:.cls} This item has the class "cls"
+
+
+    {:.ruby}
+        Some code here
+
+### References
+
+ * http://kramdown.gettalong.org/syntax.html
diff --git a/test.md b/test.md
new file mode 100644
index 000000000..4577f2076
--- /dev/null
+++ b/test.md
@@ -0,0 +1,9 @@
+---
+title: x
+layout: default
+---
+
+Hello
+{:.yes}
+
+* {:.cls} helol