Test fix for embeded iframe.

src/docs/asciidoc/jme3/math_for_dummies.adoc

@@ -10,6 +10,11 @@ ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
 == jMonkeyEngine3 Math for Dummies
 
+Iframe test
+++++
+<iframe src=https://jmonkeyengine.github.io/wiki/tutorials/math width="100%" height="850px" alt=""></iframe>
+++++
+
 iframe::https://jmonkeyengine.github.io/wiki/tutorials/math[width="100%", height="850px", alt="", scroll="true",border="true",align="false"]