How to add section numbers (1.2, 3.4.1) automatically using CSS?

Question

How to add section numbers (1.2, 3.4.1) automatically using CSS?

I currently have

h1, h2, h3, h4 {
  font-weight: normal;
}
h1 { font-size: 140%; }
h2 { font-size: 120%; color:#049;}
h3 { font-size: 110%; color:#06C;}
h4 { font-size: 105%; color:#09C;}

How to modify them so section numbers such as 1.3, 2.4.5 are automatically constructed depending on the nesting level and order of appearance of the section headers?

...

<h2>heading21</h2>
...

<h3>heading31</h3>
...

<h2>heading22</h2>

should show

1. heading21

   1.1 heading31

2. heading22

or something along those lines.

Answer 1

Hey now you can used CSS counter-increment Property

As like this Css

   body {counter-reset:section;}
    h1 {counter-reset:subsection;}
    h1:before
    {
    counter-increment:section;
    content:"Section " counter(section) ". ";
        font-weight:bold;
    }
    h2:before
    {
    counter-increment:subsection;
    content:counter(section) "." counter(subsection) " ";
    }

HTML **

<p><b>Note:</b> IE8 supports these properties only if a !DOCTYPE is specified.</p>
<h1>HTML tutorials</h1>
<h2>HTML Tutorial</h2>
<h2>XHTML Tutorial</h2>
<h2>CSS Tutorial</h2>
<h1>Scripting tutorials</h1>
<h2>JavaScript</h2>
<h2>VBScript</h2>
<h1>Heading </h1>
<h2>One </h2>
<h2>Two</h2>

**

Live demo http://jsfiddle.net/PfcX2/1/

More info click here https://developer.mozilla.org/en-US/docs/Web/CSS/counter-increment