byang wrote:
>    I am now trying to implement the HTML Meter element, and I have
> some problem on vetical alignment of box. I don't understand what the
> nsHTMLReflowMetrics.ascent is used for...

It used to be the distance from the top of the frame to the baseline (or 
ASK_FOR_BASELINE if GetBaseline() should be used instead).

>    Could anybody tell me how Mozilla use this property to determine
> the baseline alignment?

ascent controls where the baseline is with respect to the frame being 
reflow.  Alignment of that baseline with respect to other things is 
handled by the vertical-align property.

-Boris
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