[csswg-drafts] [css-flexbox] Allow fractions for order

caub has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-flexbox] Allow fractions for order ==
To allow more complex ordering, for example using Stern-Brocot trees

```html
<ul style="display: flex;flex-direction: column">
  <li style="order: 3 / 2">33333</li>
  <li style="order: 1 / 2">1111</li>
  <li style="order: 2 / 2">22222</li>
</ul>
```

https://jsfiddle.net/crl/gvffk5c4/1/

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/2202 using your GitHub account