Hi jsonkim,
I believe you are trying to create new HTML5 file using the CodeMix provided file wizard via File > New > CodeMix > HTML File ? If so, then HTML5 custom template will not be applied to the newly created file. CodeMix HTML file wizard creates new file with a default template as shown in the screenshot here: https://gyazo.com/f4db0f18761747c46c8da042b6472d9e
However if you wish apply custom template while creating new HTML file, then you can use the Eclipse provided file wizard via File > New > Web > HTML File . We tried at our end with a modified HTML5 template and it works fine as shown in screenshot here: https://gyazo.com/ca4cecbc4b8c8d64b0f0d60491641fdc
Let us know how it helps or if you have any other queries.
We’ll definitely take a look at CodeMix File wizard to see if we can provide customization.
Regards,
Shilpee
Genuitec Team