Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Deprecated
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

document.async can be set to indicate whether a XMLDocument.load() call should be an asynchronous or synchronous request. true is the default value, indicating that documents should be loaded asynchronously.

(It has been possible to load documents synchronously since 1.4 alpha.)

Example

function loadXMLData(e) {
  alert(new XMLSerializer().serializeToString(e.target)); // Gives querydata.xml contents as string
}

var xmlDoc = document.implementation.createDocument("", "test", null);

xmlDoc.async = false;
xmlDoc.onload = loadXMLData;
xmlDoc.load('querydata.xml');

Specification

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
DeprecatedNon-standard
Chrome No support NoEdge ? Firefox No support NoIE ? Opera ? Safari ? WebView Android No support NoChrome Android No support NoEdge Mobile ? Firefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android ?

Legend

No support  
No support
Compatibility unknown  
Compatibility unknown
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.

See also

Document Tags and Contributors

Last updated by: ExE-Boss,