&gt; They also ushered in the modern era of web applications by inventing XMLHttpRequest (<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;XMLHttpRequest" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;XMLHttpRequest</a>).<p>People were doing Ajax-like things before XMLHTTPRequest with hidden iframes.  XHR was more convenient, but it didn&#x27;t bring new functionality to the table.