On 12/31/09 3:07 PM, Adam Barth wrote:
Firefox and IE distinguish between about:blank documents and "" documents for this purpose, if I remember correctly.
At the moment, Firefox in fact does not. See http://hg.mozilla.org/mozilla-central/annotate/8bb9bb88e997/content/base/src/nsFrameLoader.cpp#l162
We're considering possibly changing that internally, but the resulting external behavior would still need to be the same as now.
-Boris
