= to output code result, examples: h1= @question.title p= @question.body
== yield
.content is the same as div class="content" (just a div class)
=< - output with leading white space. Same as =, but =< adds a leading white space.
| - line indicator. The pipe tells Slim to just copy the line. It essentially escapes any processing. Each following line that is indented greater than the pipe is copied over.
