Now that the patch for bug 374050 has landed
(https://bugzilla.mozilla.org/show_bug.cgi?id=374050), it is possible to
create reftests that run in a paginated context.
The page size used is 5in wide and 3in tall (with the default half-inch
margins). This is to allow tests to have less text and to make the
entire test fit on the screen.
I created the directory layout/reftests/printing to contain reftests
that require pagination.
The suggested first lines for any printing test is
<!DOCTYPE html><html class="reftest-print">
<style>html{font-size:12pt}</style>
The reftest-print class on the root element triggers the reftest to
switch into page mode on load. Fixing the font size is suggested,
although not required, because the pages are a fixed size in inches.
The underlying layout support for this mode isn't really complete; it
doesn't use exactly the same codepath as real print preview/print. In
particular, scripting and frames are likely to cause problems; I haven't
tested it, though. It also might not catch some painting regressions.
Overall, though, this should be a useful addition to the reftest framework.
-Eli
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