jekyll-html 
A Jekyll plugin to use HTML tags in Jekyll pages, posts and collections.
Installation
Add this line to your application's Gemfile:
$ gem 'jekyll-html'
And then execute:
$ bundle
Or install it yourself as:
$ gem install jekyll-html
Usage
Input:
{% st p %}
Example text
{% et p %}
{% st div class=test_class %}
{% et p class=test_class %}
Example text
{% et p class=test_class %}
{% et div %}
Output:
<p>
Example text
</p>
<div class="test class">
<p class="test_class">
Example text
</p> <!-- this tag can not have any attributes, because he closes -->
</div>