Function isShadowDomStreamingSupported

src/shadow-embed.js:308–313

(win)

 * @return {boolean}
 */
export function isShadowDomStreamingSupported(win) {
  if (shadowDomStreamingSupported === undefined) {
    shadowDomStreamingSupported = calcShadowDomStreamingSupported(win);
  }
  return shadowDomStreamingSupported;
}

/**
 * @param {!Window} win