I tried to use the tag in a template, with the source being changed with a template parameter, but apparently the parameter is not handled... Is this some known issue or is there a workaround ?
Use case :
<iframe src="https://docs.google.com/viewer?url=https://wiki.mywiki.org/wiki/Special:FilePath/{{{file}}}&embedded=true" style="width:100%; height:{{{height|500px}}}" frameborder="0"></iframe>