my-idlers/node_modules/autoprefixer/lib/hacks/background-size.js

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let Declaration = require('../declaration')
class BackgroundSize extends Declaration {
/**
* Duplication parameter for -webkit- browsers
*/
set (decl, prefix) {
let value = decl.value.toLowerCase()
if (
prefix === '-webkit-' &&
!value.includes(' ') &&
value !== 'contain' &&
value !== 'cover'
) {
decl.value = decl.value + ' ' + decl.value
}
return super.set(decl, prefix)
}
}
BackgroundSize.names = ['background-size']
module.exports = BackgroundSize