/*** @class Global_CSS*/require('icon');/*** Generates style rules for an icon element** @param {list/string} $glyph* A unicode character to use as the icon, or a list specifying the character to use* followed by font-family and degrees of rotation (90, 180, or 270).* All parameters in the list are optional except for glyph. For example, each of the* following is valid:** Use the letter "A" as the icon and use the default font-family** @include font-icon('\0041');** Use the letter "A" as the icon and use FontAwesome as the font-family** @include font-icon('\0041' FontAwesome);** Use the letter "A" as the icon and rotate the icon 90 degrees clockwise.** @include font-icon('\0041' 90);** Use the letter "A" as the icon, use FontAwesome as the font-family, and rotate the icon* 90 degrees clockwise.** @include font-icon('\0041' FontAwesome 90);** @param {color} $color** @param {number} $size* The size of the icon element** @param {number} $size-big* The size of the icon element in the {@link Global_CSS#$enable-big big} sizing scheme** @param {number} $font-size* The font-size of the icon. Applied to the :before pseudo element so that it does not affect* `$size` when `$size` is specified in `em` units.** @param {number} $font-size-big* The font-size of the icon in the {@link Global_CSS#$enable-big big} sizing scheme.* Applied to the :before pseudo element so that it does not affect `$size-big` when* `$size-big` is specified in `em` units.** @private*/