'Segoe UI' font with font-face & local

Question

I want to use the "Segoe UI" font in a website if it is installed in the user's computer.

I have declared all the styles with @font-face in order to use the font-weight property to change the thickness of the font (it's a really cool feature!).

The problem is that I cannot do it work with Segoe UI Bold (I think the name is wrong). Any idea?

Here an example. (4) and (5) would be the same: http://jsfiddle.net/kxHQR/1/

---

@font-face {
  font-family: 'Myname';
  font-style: normal;
  font-weight: 700;
  src: local('Segoe UI Bold'), local('SegoeUI-bold'), local('segoeuib');
}
@font-face {
  font-family: 'Myname';
  font-style: normal;
  font-weight: 600;
  src: local('Segoe UI Semibold'), local('SegoeUI-Semibold');
}
@font-face {
  font-family: 'Myname';
  font-style: normal;
  font-weight: 400;
  src: local('Segoe UI'), local('SegoeUI');
}
@font-face {
  font-family: 'Myname';
  font-style: normal;
  font-weight: 300;
  src: local('Segoe UI Light'), local('SegoeUI-Light');
}

/* ... */

BODY {
 font-family: 'Myname';    
}

.boldtext {
    font-family:'Segoe UI';
    font-weight:700;
}

<p style='font-weight:300'>1. Text with font-weight:300. OK</h1>
<p>2. Here is normal text. OK</p>
<p style='font-weight:600'>3. Text with font-weight:600.  OK</p> 
<p style='font-weight:700' >4. Text with font-weight:700. It must be like (5), but it is like (3). :(</p>
<p class='boldtext'>5. Text with font-family:'Segoe UI' (no font-face) and font-weight:700; </p> 

Answer 1

This is from Microsoft's own stylesheet for Windows 8 (Metro) apps:

/*
Explicitly define a Segoe UI font-family so that we can assign Segoe UI 
Semilight to an appropriate font-weight.
*/
@font-face {
    font-family: "Segoe UI";
    font-weight: 200;
    src: local("Segoe UI Light");
}
@font-face {
    font-family: "Segoe UI";
    font-weight: 300;
    src: local("Segoe UI Semilight");
}
@font-face {
    font-family: "Segoe UI";
    font-weight: 400;
    src: local("Segoe UI");
}
@font-face {
    font-family: "Segoe UI";
    font-weight: 600;
    src: local("Segoe UI Semibold");
}
@font-face {
    font-family: "Segoe UI";
    font-weight: 700;
    src: local("Segoe UI Bold");
}
@font-face {
    font-family: "Segoe UI";
    font-style: italic;
    font-weight: 400;
    src: local("Segoe UI Italic");
}
@font-face {
    font-family: "Segoe UI";
    font-style: italic;
    font-weight: 700;
    src: local("Segoe UI Bold Italic");
}

The above approach works for me and is also the approach used by Open Sans and Google fonts. However, it is the exact opposite of this approach, originally from Paul Irish:

@font-face {
    font-family: 'ChunkFiveRegular;
    src: url('whatever source');
    font-weight: normal;
    font-style: normal;
}

Paul Irish's approach allows (read: requires) setting weights and italics later in the CSS, but the result is "faux": Since the browser doesn't have all the fonts in the family, it has to calculate the weight and shape of the characters on its own to make up for that. The single, and limited strength in Paul's approach is that it might reset the font across all browsers - but it does depend on the font in use - because all browsers render fonts differently!

I like Microsoft's approach better, because it allows to specify the font-styles and font-weights you need, and the browser will display the correct font file, instead of computing faux sizes, bold and italics. However, it does require you to provide a font file for every font variation in the family you'll be using.

In the end it all comes down to what font you'll be using and how you use it (different weights, italics, etc). Regardless of what approach you go for, I recommend out of my own experience (and Paul recommends too) to use FontSquirrel's font-face generator for all your web typography endeavors. FontSquirrel can significantly reduce font sizes, by leaving out unnecessary character sets, compressing the fonts, and so on.