Text
The text above should be roughly half size.
The following tests are dependent on support for height on images. To see, here's an image that should be 5 pixels high: 
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x |
x |
x |
x |
x |
x |
The three x's above should all be the same size as the image next to them.
If the three images above appear as a single rectangle (albeit one with obvious joins), the browser is guilty of using an arbitrary value for ex - they all have height: 10ex. They also have different generic fonts declared (in one case monospace, in another serif, in the other sans-serif), which means they will all have different x-heights.