sass

The second article to say suss

    suss is easy to use , sass can choice element , romance element for their child , you will needn't use complex code for css

    ul li{font-size:12px}
    sass=>
    ul{
        li{
            font-size:12px;
        }
    }

use flow to show it 

 this is i use markdown uml photo firstly so ugly is neccessary you can ingnore it ,if you aren't 

sass can use @include ...