View source for NPAPI:BrowserZoomLevelQuery

== Status  ==

Initial Draft

== Contributors  ==

*Last modified: 2016-01-28
*Authors: Kyle Machulis (Mozilla)

== Overview  ==

Currently, NPAPI plugins have no way to know if the browser is running
at a CSS zoom level other than 1x. We need an addition to the API that
allows plugins to query the current browser CSS zoom level.

== Specification  ==

We'll need to add a NPNV variable:

<pre>  	
NPNVCSSZoomFactor = 23
</pre>

This can be retrieved via NPN_GetValue, and will return a double
representing the current CSS zoom level of the browser. Since changing CSS
zoom levels updates the window properties, this value can be re-queried
during NPN_SetWindow or other window property update calls, to see if
a zoom change has been made. It will also be sent via NPP_SetValue so that 
plugins can be notified when it changes.

== Relevant Bugs ==

[https://bugzilla.mozilla.org/show_bug.cgi?id=1171182 Bug 1171182 - Implement browser zoom query in NPAPI]