withHackValue(decl) {
    return (
      (decl.prop === '-webkit-background-clip' && decl.value === 'text') ||
      // Do not remove -webkit-box-orient when -webkit-line-clamp is present.
      // https://github.com/postcss/autoprefixer/issues/1510
      (decl.prop === '-webkit-box-orient' &&
        decl.parent.some(d => d.prop === '-webkit-line-clamp'))
    )
  }
Some rare old values, which is not in standard