| 123456789101112131415161718 | let Value = require('../value')class ImageSet extends Value {  /**   * Use non-standard name for WebKit and Firefox   */  replace(string, prefix) {    let fixed = super.replace(string, prefix)    if (prefix === '-webkit-') {      fixed = fixed.replace(/("[^"]+"|'[^']+')(\s+\d+\w)/gi, 'url($1)$2')    }    return fixed  }}ImageSet.names = ['image-set']module.exports = ImageSet
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