ie_hex_str($color) Converts a color into the format understood by IE filters.

opacity($color) Returns the alpha component (opacity) of a color. This is 1 unless otherwise specified.

Function Directives It is possible to define your own functions in sass and use them in any value or script context. For example:

str_index($string, $substring) Returns the index of the first occurrence of $substring in $string

selector_unify($selector1, $selector2) Unifies two selectors into a single selector that matches only elements matched by

selector_nest($selectors...) Return a new selector with all selectors in $selectors nested beneath one another

@media @media directives in Sass behave just like they do in plain CSS, with one extra capability: they can be nested

abs($number) Returns the absolute value of a number.

simple_selectors($selector) Returns the simple

Nested Rules Sass allows CSS rules to be nested within one another. The inner rule then only applies within the outer rule’s selector. For example: