counters($args...) This function only exists as a workaround for IE7‘s

unitless($number) Returns whether a number has units.

@for The @for directive repeatedly outputs a set of styles. For each repetition, a counter variable is used to adjust

hue($color) Returns the hue component of a color. See

Pattern: element.CLASSNAME   Definition: The element.CLASSNAME selector

Pattern: *   Definition: The * selector matches the name of any

keywords($args) Returns the map of named arguments passed to a function or mixin that takes a variable argument list. The

invert($color) Returns the inverse (negative) of a color. The red, green, and blue values are inverted, while the opacity

Pattern: [attr$=substring]   Definition: The [attr$=substring] selector

selector_extend($selector, $extendee, $extender) Returns a new version of $selector with $extendee