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Deprecated
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.
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.
document.async can be set to indicate whether a document.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');