# I need an explanation of this

**URL:** <https://forum.kirupa.com/t/i-need-an-explanation-of-this/166994>\
**Category:** Uncategorized\
**Created:** [October 24, 2005, 4:34pm UTC](https://forum.kirupa.com/t/i-need-an-explanation-of-this/166994 "2005-10-24T16:34:24Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![RAMON](https://avatars.discourse-cdn.com/v4/letter/r/34f0e0/32.png) [@RAMON](https://forum.kirupa.com/u/RAMON)\
**Post date:** [October 24, 2005, 4:34pm UTC](https://forum.kirupa.com/t/i-need-an-explanation-of-this/166994/1 "2005-10-24T16:34:24Z")

</div>

I am not new to CSS but today I saw something I didnt know could be done. I saw this when viewing the code at [www.stuffandnonsense.co.uk](http://www.stuffandnonsense.co.uk).

```auto
body[id="stuffandnonsense-co-uk"] { 
padding : .5em; 
font : 70%/160% Tahoma, Verdana, "Lucida Sans Unicode"; 
background : #fff; 
color : #000; 
text-align : center; }

```

What I was ignorant of is the fact that you can put selectors inside of brackets.

```auto
[id="stuffandnonsense-co-uk"]

```

Can anyone explain this to me? I have been browsing the internet for an answer but I have yet to find one. Also I have not read it in any books. Is this some kind of css3 ability or what?

One other question I might add. What is the deal with the font property having the 70%/160% is that actually giving font sizes? Didnt know you could do that either.