[Gecko Bug 1866738] Make initial about:blank docs always transparent, even in content docshells. #43415
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This implements the proposed fix to
w3c/csswg-drafts#9624, and adds a tentative
test for it.
Differential Revision: https://phabricator.services.mozilla.com/D194751
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1866738
gecko-commit: 1dcc9b5526c21fb2c7cc5ff2e5aaebdaf3a0648c
gecko-reviewers: jwatt