ant-design-vue/components/_util/isFlexSupported.js

export default function isFlexSupported () {
  if (typeof window !== 'undefined' && window.document && window.document.documentElement) {
    const { documentElement } = window.document
    return 'flex' in documentElement.style ||
      'webkitFlex' in documentElement.style ||
      'Flex' in documentElement.style ||
      'msFlex' in documentElement.style
  }
  return false
}