On May 29, 2007, at 6:14 PM, David D. Kilzer wrote:

2- Why is the render tree dumps different for each platform?

They should be the same, but invariably differences in fonts (and thus font metrics) may cause the pages to be laid out slightly differently. I'm not sure if there are any other differences; in "theory", they should be the same for
all platforms.

There are other valid reasons why the render tree dumps are different from platform to platform. One such reason is that each platform implements their own form controls, and the metrics for these controls varies from platform to platform.

-Adam
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