Does HTML5 canvas support browser-based zooming?

I had setup a simple canvas with a fillText drawn on it. It looks quite good, but when I use the browser provided zooming feature (Safari, Firefox), the antialiasing looks ugly.

I tried to use scale() raise the grid, but it doesn't help.

Is there any way to draw on a canvas that it looks sharp even with a zoomed browser window?

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Screenshot (no zoom): http://i.stack.imgur.com/CGWka.png

Screenshot (max zoom): http://i.stack.imgur.com/vNPjF.png

Source: Tips4all, CCNA FINAL EXAM