Hot answers tagged orthography
It's because を is not used in post-1946 orthography. All of the をs were changed to おs, for example, おかしい, おとこ. The only reason we use it today is because it was retained in the particle を, but it's not the correct spelling of any dictionary word. (ヲタク is slang.) My 新明解 lists four words that start with を, and they are all grammatical terms relating to the ...
There are basic rules about the use of commas in Japanese but these are not absolute. I think a writer can use commas as they like to make a sentence easier to read. And I don't think there is a clear rule in Japanese as you say.
⇳ (The upper image from: http://p.twipple.jp/zAedi; the lower from: http://portal.nifty.com/cs/mitaiwa/detail/100607127809/1.htm)
If the text has been laid out properly by a designer the words will wrap right after the particle for more natural flow (が、を、は etc). For a websites in Japanese, because there is no whitespace between characters the sentence is treated as one 'word' and will break wherever it needs to.
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