How can I create a calc mixin to pass as an expression to generate tags?

css, sass

Solution

It would be a basic mixin with an argument, thankfully the expressions are not browser-specific within the supported scope:

@mixin calc($property, $expression) {
  #{$property}: -webkit-calc(#{$expression});
  #{$property}: calc(#{$expression});
}

.test {
  @include calc(width, "25% - 1em");
}

Will render as

.test {
  width: -webkit-calc(25% - 1em);
  width: calc(25% - 1em);
}

You may want to include a "default" value for when calc is not supported.

Problem

I am working on a sass stylesheet in which I wish to use the `calc` element to dynamically size some content. As the `calc` element has not been standardized, I need to target `calc()`, `-moz-calc()`, and `-webkit-calc()`. Is there a way for me to create a mixin or function that I can pass an expression to so that it will generate the required tags that can then be set as a `width` or `height`?

Original source