| 123456789101112131415161718192021222324252627282930313233 | let Declaration = require('../declaration')class GridStart extends Declaration {  /**   * Do not add prefix for unsupported value in IE   */  check(decl) {    let value = decl.value    return !value.includes('/') && !value.includes('span')  }  /**   * Return a final spec property   */  normalize(prop) {    return prop.replace('-start', '')  }  /**   * Change property name for IE   */  prefixed(prop, prefix) {    let result = super.prefixed(prop, prefix)    if (prefix === '-ms-') {      result = result.replace('-start', '')    }    return result  }}GridStart.names = ['grid-row-start', 'grid-column-start']module.exports = GridStart
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