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.
msCaching read/write property specifies whether stream data downloaded using XMLHttpRequestis cached to disk or not.
One of the following strings:
The caching for stream or ms-stream data is disabled.
The caching for stream or ms-stream data is enabled.
The caching for any data is disabled.
This feature is not part of any current specification. It is no longer on track to become a standard.
This proprietary method is specific to Internet Explorer.