非标
此特征是非标准的，且不在标准轨道中。不要在面向 Web 的生产站点中使用它：它不适用于每个用户。实现之间可能存在大的不兼容性，且行为将来可能改变。
msGetRegionContent
returns an array of Range instances corresponding to the content from the region flow that is positioned in the region.
This proprietary method is specific to Internet Explorer browser.
var retVal = Element.msGetRegionContent();
retVal [out, reval]
类型： MSRangeCollection
The name of the property to enable.
类型： 布尔
Returned ranges are sorted by document position and do not overlap. If an element is not a region, this method throws a
DOMException
采用
InvalidAccessError
error code. This is only available to regions that are document elements and not to regions that are pseudo-elements.
