As of  August 29 I intend to turn the CSS mask-type property on by default on 
all platforms. It has been developed behind the layout.css.masking.enabled 
preference.

The feature implementation was done with the following bug report : 
https://bugzilla.mozilla.org/show_bug.cgi?id=793617

WebKit and Blink implement mask-type as well and ship it since Chrome 24 and 
Safari 7.


Articles and documentations about mask-type can be found here:

https://developer.mozilla.org/en-US/docs/Web/CSS/mask-type
http://mcc.id.au/blog/2012/12/mask-type


The specification is CSS Masking Level 1, currently in CR.

http://www.w3.org/TR/2014/CR-css-masking-1-20140826/


I’ll upload the patch for shipping here:

https://bugzilla.mozilla.org/show_bug.cgi?id=1058519

Greetings,
Dirk
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