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Created Nov 29, 2012
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.rgba(@colour, @alpha) {
@alphaColour: hsla(hue(@colour), saturation(@colour), lightness(@colour), @alpha);
@ieAlphaColour: argb(@alphaColour);
background-color: @colour; // Fallback for older browsers
// IE hacks
zoom: 1; // hasLayout
background-color: transparent\9;
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=@{ieAlphaColour}, endColorstr=@{ieAlphaColour})"; // IE 8+
filter: ~"progid:DXImageTransform.Microsoft.gradient(startColorstr=@{ieAlphaColour}, endColorstr=@{ieAlphaColour})"; // IE 6 & 7
background-color: @alphaColour;
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