name : background-size.js 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