I was reading up on changing placeholder text when I stumbled across [this question](https://stackoverflow.com/a/3949453/3436942).

I went back and learnt about placeholders, anyway. And one SO answer said something along the lines of:

> 
> Be careful when designing your placeholder text, since anything outside of the control will be cut off.
> 
> 
> 

Putting these two answer together, it made me think (yes, I know, bad thing to do!) -

**What is the longest letter in EM in Global (language) terms?**
================================================================

*(since we are meant to size letters in EM and all).*

The longest in the ***English*** Alphabet is 'W' apparently (from linked Question) - so in terms of global languages, what is?

---

---

If I had a control such like:

```
+------------------------+
|123456789101112131415161|
+------------------------+

```

where the placeholder was 24 numbers long. How can i ensure they all fit?

Since numbers seem to be the same EM width:

```
11111
22222
33333
44444
55555
66666
77777
88888
99999

```

How can I ensure that 24 characters, no matter what length/EM width will fit?

I could just go:

```
+------------------------+
|WWWWWWWWWWWWWWWWWWWWWWWW|
+------------------------+

```

But what if there is a wider letter used from another language? How can I ensure that the placeholder text can be read? (without resizing the input itself dynamically)? I literally want the minimum width it would have to be to display 24 characters, no more - no matter what language is placed in the field.

---

---

Here's an example of an even longer 'letter' than English's **W**:

> 
> WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
> ŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒŒ
> ÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆ
> 
> 
> 

**EDIT**

I know *how* i would test (as above) but not 'contenders' as to which is the widest character in the world?