Google Chrome is built around Webkit in a way that allows it to grab the 
latest version of Webkit from time to time, so new Webkit features and 
fixes get implemented automatically.

Adobe took a specific old version of the Webkit code and modified it to 
create AIR. New Webkit features and fixes only get implemented if the 
Adobe guys retrofit the changes to their code.

When the Google API sees a browser identify itself as "Webkit", it 
assumes that it correctly supports <canvas>, but AIR is based on a 
version of Webkit that doesn't provide all the <canvas> features that 
Google Maps uses. In particular semitransparent polys.

AIR allows the user to change its user agent string. If they edit it, 
replacing "Webkit" with "Firefox" then the API will use SVG instead of 
<canvas>, producing a better result. However, there's nothing you can do 
on your page that will produce this behaviour.

-- 
http://econym.org.uk/gmap
The Blackpool Community Church Javascript Team


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