wkhtmltopdf/wkhtmltopdf — pull request #2084 by pvandertak (2014-12-03 14:18:49+00:00)
Title: Make background transparent in generated PDF (instead of white).

Previously, wkhtmltopdf rendered a white background explicitly. This makes it impossible to use the generated PDF as an overlay for another PDF (merging the PDFs using other tools). This patch removes the default-white background. Note that it is still possible to force the white background using

, but I don't think that is normally useful.