TinyMCE stripping our the <data> element

[jgmac1106]

I am trying to add this to source code
<data class="p-category" value="$status">listening to</data> but every time I look the data element gets stripped.

[lindner]

Some info on using custom tags here:

https://stackoverflow.com/questions/38733649/can-i-use-polymer-elements-webcomponents-with-tinymce