HTML5 Canvas issue with iOS Safari

I am trying to build a painting application in HTML5.
I have an HTML5 Canvas in a div. This div is masked with an SVG file using -webkit-mask.
On iOS Safari and in iBooks Fixed Layout: When you zoom the page by gesture, the mask suddenly stops working revealing the entire canvas and the contents of the div.
1. There is no problem if the contents of the div is an image. Problem is only with Canvas inside.
2. The problem seemed to happen when the zoom crosses a mark - possibly 50%. I.e, if you have already zoomed over 50% and refresh the page, there is no problem until you zoom out below 50% and vice-versa.
Any help would be greatly appreciated.

Hello Corey,
I have been trying to work on this issue, but I haven't made much progress
Breaking up the project into several small chunks seemed to help for the iPad, but it's not ideal.
I'm seriously struggling with Android tablets though.  Android doesn't support flash anymore, as HTML5 is the "future". Google Chrome on Android tablets has problems with synchronizing animations and sounds cutting out (works fine on a desktop or notebook).  FireFox on Android didn't have the sync or sound issues, but it crashes at random times. I think the root cause behind all this is HTML5 and the browser.  I couldn't figure out the difference between chrome on desktops and notebooks -vs- tablets.  I went to html5test.com and compared the two browsers, and there is definitely a difference between the two browsers.
When you look at authoring alternatives to Captivate, it seems like their customers are having similar issues.
I'm still looking for a workaround.  I'll let you know if I find anything

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