getting larger, more complex, and harder to maintain. This is where a preprocessor can help. Sass lets you use features that don’t exist in CSS yet like variables, nesting, mixins, inheritance and other nifty goodies that make writing CSS fun again. - sass-lang.com
of complexity that a programmer may extend using their own code. It might include a set of software libraries, compilers, interpreters, or an API. In general, it provides an environment that facilitates a speci c type of programming for a project. - computerhope.com
var source = document.getElementById('mytemplate').innerHTML; var template = Handlebars.compile(source); var context = { title: 'My New Post' }; var html = template(context); Result <h1>My New Post</h1>