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Fix: Prevent flipping percentages in CSS color functions #93

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Fix: Prevent flipping percentages in CSS color functions #93

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13 changes: 9 additions & 4 deletions src/cssjanus.js
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Original file line number Diff line number Diff line change
Expand Up @@ -182,12 +182,17 @@ function CSSJanus() {
* @return {string} Inverted property
*/
function calculateNewBackgroundPosition( match, pre, value ) {
var idx, len;
// Check if inside a known color function
var lowerPre = pre.toLowerCase();
if (/(?:rgb|rgba|hsl|hsla|hwb|lab|lch|oklab|oklch|color|color-mix|linear-gradient)\(/.test(lowerPre)) {
// Do not flip if inside a color function
return pre + value;
}

if ( value.slice( -1 ) === '%' ) {
idx = value.indexOf( '.' );
var idx = value.indexOf( '.' );
if ( idx !== -1 ) {
// Two off, one for the "%" at the end, one for the dot itself
len = value.length - idx - 2;
var len = value.length - idx - 2;
value = 100 - parseFloat( value );
value = value.toFixed( len ) + '%';
} else {
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