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I was intrigued by this question: [What do you do if a genkoyoshi line ends
with e.g. す。」?](https://japanese.stackexchange.com/questions/17360/what-do-
you-do-if-a-genkoyoshi-line-ends-with-e-g-%E3%81%99) and its answer.

I'm not any good at this 原稿用紙 but I remember being told for some types of
forms (which I thought followed the same rules) that you need to put the
[濁点]{だくてん} (for some reason always called ten-ten and maru in the classes and
contexts I heard them) into separate boxes. Was I being misled / is this still
current practice for some sort of form?
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handwriting genkōyōshi
On 原稿用紙, when are ゛ and ゜ (ten-ten and maru) supposed to occupy a square of their own?
The rule you mentioned does not apply to 原稿用紙 for novels and articles. Never.

However, you may be instructed to place 濁点（゛） and 半濁点（゜）into a separate box,
when you have to fill some legacy paper forms at banks or government offices.

[![enter image description
here](https://i.stack.imgur.com/ZccLb.png)](https://i.stack.imgur.com/ZccLb.png)

This is because 濁点 and 半濁点 consume an extra byte if you encode [hankaku
katakana](http://en.wikipedia.org/wiki/Half-width_kana) strings into old
encodings such as JIS, Shift-JIS, EUC-JP, and they have to count the number of
bytes.

In my opinion, this is a very bad tradition of the fixed-length-string era,
and should disappear at once.
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answer