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.
Element.currentStyle is a property which is a proprietary similar to the standardized
window.getComputedStyle method. It is available in old versions of Microsoft Internet Explorer. However, it returns the units set in CSS while window.getComputedStyle returns the values in pixels.
Not part of any specification.
Microsoft has a description on MSDN.
|Feature||Chrome||Firefox (Gecko)||Internet Explorer||Microsoft Edge||Opera||Safari (WebKit)|
|Basic support||No support||No support||6||No support||No support||No support|
|Feature||Android||Firefox Mobile (Gecko)||IE Phone||Opera Mobile||Safari Mobile|
|Basic support||No support||No support||?||?||No support|