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The preview also doesn't show that urls will be automatically converted from http://domain.tld/path/to/page to a link that doesn't show the protocol like domain.tld/path/to/page.
Better off using @match so that http/https and domain+subdomains can all be covered by a single rule per domain. e.g. //@match *://*.stackoverflow.com/* covers Stack Overflow & Meta Stack Overflow, and //@match *://*.stackexchange.com/* covers all sites at subdomain.stackexchange.com, and their meta sites.
Also, it seems marked is throwing Uncaught Error: Infinite loop on byte: 10 when a new line (entered by pasting something with multiple lines, or pressing Shift+Enter) is in the comment field.
When certain characters (<, >, &) are inside code blocks (text surrounded by backticks), they appear as the associated html entities (<, >, &) instead of the character that they are (and will be in the actual comment) in the preview.
@Filnor: The same person also said a little later in the same thread that scraping info from the website is OK if it only happens when someone clicks a button on a website. So, (assuming you cache what you find so it doesn't happen every time someone clicks it), couldn't the "numeric site ID" of every site be scraped from stackexchange.com/leagues if someone tries to check one that's not already known?
@Filnor: At the time I was just thinking I'd like to use it on SuperUser, but for those of us who aren't Jon Skeet, we're more likely to actually be in a decently high top x% of the smaller sites. I see no reason why others wouldn't want to use this with whichever beta sites they frequent (as I start to gain some more rep, I know I would). It's too bad that "we can't read the numeric site id from the API". I feel like that should be available, don't you?
As noted by HyperNeutrino, Mr. Xcoder and j-f1, this no longer works because of the 'new top bar'. Do you have plans to fix this? or is the project dead now?