Non-standard system metric pseudo-classes and media features have been removed

Published: | Categories: CSS

Description

The non-standard, moz-prefixed system metric pseudo-classes and media features are no longer available from web content because those CSS extensions could be abused for fingerprinting purposes.

The pseudo-classes starting with :-moz-system-metric, such as :-moz-system-metric(mac-graphite-theme), :-moz-system-metric(scrollbar-end-backward) and :-moz-system-metric(touch-enabled), have been removed.

The following media features have also been removed:

The only exception is the -moz-touch-enabled media feature which will be kept until the standard alternative Interaction Media Features are implemented in Firefox.

References