In the older days I thought popup window was a good idea, but then… it’s not. IE trimmed html form GET values to 2000 characters, so submitting the whole music source in GET method will be disastrous. Thus today I replaced javascript popup window with another thing instead: <form target="…">, which submits via POST method instead and opens it in new browser window or new tab. Creating cross-browser webpage is really a headache…
But then, another obstacle comes. To make the show source window more convenient, a button is added to copy content to clipboard (idea taken from LatexRender). That’s trivial to do in IE, but a completely different story in Mozilla/Firefox.
Even though relevant script exists for Mozilla based browsers, it requires that javascript signing thing, which is so 1998′ish — I barely remembered fooling around javascript signing at that time and wondered what it was. Surprised to see such thing still existed today. Anyway, it is impractical to show dialog asking people to accept the authority of javascript, or even telling user to modify their own browser setting.
Though somebody came up with ingenious way to bypass security setting (using flash to access clipboard), I’m not sure if I really want such thing bundled with the plugin.
BTW, people are free to check if the show source function works in my previous post, by clicking on the image.