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In Latin characters, we use `&mdash;` to represent the em dash (--) as
follows.

> My home town -- a small castle town in San'in ...

However, if I use the same `&mdash;` in Japanese sentences, it looks like
一{いち} as follows.

> 私が生まれ育ったふるさと--山陰の小さな城下町・・・

It should be about twice as long as the Latin one. The following was taken
from a textbook (might be rendered by TeX).

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

# Question

What is the correct punctuation for em dash in Japanese? HTML code is
preferred.
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punctuation
Is Japanese em dash equal to Latin em dash?
That's a mark that isn't a standard character. According to the wiki page
below, it's basically the same as the em-dash, but often two are written
together ―― to make it long enough.

<https://ja.wikipedia.org/wiki/%E3%83%80%E3%83%83%E3%82%B7%E3%83%A5_(%E8%A8%98%E5%8F%B7)>

By the way, if you're trying to type it out, somebody's already done it for
you here: <https://www.douban.com/group/topic/14352302/>
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This kind of long dash is sometimes called 2倍ダッシュ, 倍角ダッシュ or ダブルダッシュ when
there is a technical reason to distinguish. But untrained Japanese people call
this simply as **ダッシュ**.

Some punctuation marks imported from Western countries tend to be wider in
Japanese typography, because ordinary characters like kanji are already wider
than English letters. As you said, the em-dash in Latin fonts is obviously too
short in Japanese sentences.

Unfortunately, there is no simple way to reproduce this 2倍ダッシュ in HTML. One
ugly but easy way is to use 全角ダッシュ (full-width dash) twice. The 全角ダッシュ should
be available whenever Japanese fonts are available. The Japanese 全角ダッシュ and
the English em-dash are mapped to the same character (U+2014 `EM DASH`) in
Unicode:

>   * 生まれ育ったふるさと——山陰
>   * 生まれ育ったふるさと----山陰
>

The first example above uses two 全角ダッシュ directly, and the second example uses
two `&mdash;`:

```

    - 生まれ育ったふるさと——山陰
    - 生まれ育ったふるさと&mdash;&mdash;山陰
    
```

In my browser (Chrome on Windows), there is no visible difference between the
two lines, but there is a small space between the two dashes.

If you are using a good software, this space will not be visible (at least in
Japanese fonts). Some DTP applications can also automatically prevent a line
break between the two dashes, effectively allowing you to treat two 全角ダッシュ as
one character.

[![enter image description
here](https://i.stack.imgur.com/b7tNB.png)](https://i.stack.imgur.com/b7tNB.png)
(Adobe InDesign)
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answer
There is a unicode character for the two-em dash:

[![enter image description
here](https://i.stack.imgur.com/6s9hl.png)](https://i.stack.imgur.com/6s9hl.png)

It is possible to represent any unicode character in HTML [Using character
escapes in markup](https://www.w3.org/International/questions/qa-escapes). For
the two-em dash, it would be `&#x2E3A;`

You could also directly include the character in your markup as ⸺ if your html
file has the `<meta charset="utf-8" />` meta tag.
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