'use strict';

var parsers = require('../parsers');

var isValid = module.exports.isValid = function isValid(v) {
    return parsers.valueType(v) === parsers.TYPES.KEYWORD &&
        (v.toLowerCase() === 'scroll' || v.toLowerCase() === 'fixed' || v.toLowerCase() === 'inherit');
};

module.exports.definition = {
    set: function (v) {
        if (!isValid(v)) {
            return;
        }
        this._setProperty('background-attachment', v);
    },
    get: function () {
        return this.getPropertyValue('background-attachment');
    },
    enumerable: true,
    configurable: true
};