note the idea of layers for canvas (whatwg r3024)

note the idea of layers for canvas (whatwg r3024)

CanvasRenderingContext2D
http://people.w3.org/mike/diffs/html5/spec/Overview.1.2185.html#canvasrenderingcontext2d

http://people.w3.org/mike/diffs/html5/spec/Overview.diff.html
http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.2184&r2=1.2185&f=h
http://html5.org/tools/web-apps-tracker?from=3023&to=3024

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RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.2184
retrieving revision 1.2185
diff -u -d -r1.2184 -r1.2185
--- Overview.html	29 Apr 2009 06:17:18 -0000	1.2184
+++ Overview.html	29 Apr 2009 06:21:04 -0000	1.2185
@@ -19663,6 +19663,9 @@
   - turning off antialiasing to avoid seams when patterns are painted next to each other
     - might be better to overdraw?
     - might be better to just draw at a higher res then downsample, like for 3d?
+  - nested layers
+    - the ability to composite an entire set of drawing operations with one shadow all at once
+      http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2008-August/015567.html
 -->
   // colors and styles
            attribute any <a href="#dom-context-2d-strokestyle" title="dom-context-2d-strokeStyle">strokeStyle</a>; // (default black)