Modernizr and Yep / Nope functions

SassMeister-input.scss

// ----
// Sass (v3.2.10)
// Compass (v0.13.alpha.4)
// ----

// MODERNIZR Checks following "yep" and "nope" conventions

@mixin modernizr($tests...) {
    $selector: 'html';
    @each $test in $tests { $selector: "#{$selector}.#{$test}"; }
    #{$selector} & { @content; }
}
@mixin yep($tests...) {
    $selector: 'html';
    @each $test in $tests { $selector: "#{$selector}.#{$test}"; }
    #{$selector} & { @content; }
}
@mixin nope($tests...) {
    $selector: 'html';
    @each $test in $tests { $selector: "#{$selector}.no-#{$test}"; }
    #{$selector} & { @content; }
}

.test {
    color: blue;
    @include yep(csscolumns) {
        columns: 2;
    }
    @include nope(columns, borders) {
        color: red;
    }
    @include modernizr(borders, no-csscolumns) {
        width: 100%;
    }
}

SassMeister-output.css

.test {
  color: blue;
}
html.csscolumns .test {
  columns: 2;
}
html.no-columns.no-borders .test {
  color: red;
}
html.borders.no-csscolumns .test {
  width: 100%;
}