The "two spaces" thing also complicated by the fact that in so many contexts the extra space is simply ignored, as browsers ignore additional whitespace by defa

The "two spaces" thing also complicated by the fact that in so many contexts the extra space is simply ignored, as browsers ignore additional whitespace by default and so much writing and reading takes place through a browser or some other thing rendering HTML these days. Of course you can do things like "pre" formatting or insertion of non-breaking spaces to force their rendering, but that's somewhat rare. I wonder if HN does that? Doesn't look like it.