@Roy Horev  Can you tell us a bit more about your case? What are you trying to achieve? HTML is not able to use logical statements like that (not an expert, though). 

@Kevin Bendixen I am looking for a similar feature. In my case, I'd like to evaluate if a specific user attribute equals a certain value and display something differently if that's the case. In our case we'd use it for localizing the template. I'd expect to be able to use something like this:

{% if language == "de" %}
  German text
{% else %}
  English text
{% endif %}