Yes, it makes the request high priority: https://medium.com/dev-channel/javascript-loading-priorities-in-chrome-57c54cfa6672 https://medium.com/dev-channel/java

Yes, it makes the request high priority: https://medium.com/dev-channel/javascript-loading-priorities-in-chrome-57c54cfa6672 https://medium.com/dev-channel/javascript-loading-priorities... > than the server just instructing the client not to cache it Easier said than done, especially when it's served from a CDN you don't control the headers of. Using a <script> tag and a callback is known as JSONP– this technique is used to bypass Cross-Origin Resource Sharing (CORS) for data fetching.