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.
Summary
The ::-ms-reveal CSS pseudo-element is used to display and apply styles to the "password reveal button" usually displayed at the edge of an <input> element of type="password" in Internet Explorer 10+. The password reveal button displays the value of the password field in plain text (instead of the usual obscured-for-privacy all-asterisks display). This button and the pseudo-element are non-standard and specific to Internet Explorer 10+, hence the vendor prefix.
Specifications
Not part of any specification.
Microsoft has a description on MSDN.
Browser compatibility
| Feature | Firefox (Gecko) | Chrome | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | Not supported | Not supported | (Yes) | Not supported | Not supported |
| Feature | Firefox Mobile (Gecko) | Android | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | Not supported | Not supported | (Yes) | Not supported | Not supported |