In sass what does the = mean

Question

For example in the following from sass. Is the = just a shorthand for @mixin? I can't seem to find any info for this on google

=multi-line-button($base-color)
  +background-clip('padding-box')
  border-width: 1px
  +border-radius(6px)
  border-style: solid
  color: white
  display: block
  margin: 0.2em auto
  padding: 12px 15px
  text-align: center
  text-decoration: none

Answer 1

yes, this is the way to define mixins in Sass

dunno if this article will help at all

EDIT:

The following are identical

@mixin red-text
  color: #ff0000

=red-text
  color: #ff0000

Just add +red-text to your selectors

Answer 2

"@mixin foobar" is the newer SCSS syntax (more CSS-like) and "=foobar" is the older SASS syntax (more HAML-like). I'm fairly new to SASS and started with SCSS, but both are supported (probably not in the same stylesheet) and both will continue to be supported.