Thursday 11th of March 2010 02:18:15 AM

CSS Tutorials > Making Lists Look Nicer with CSS

Making Lists Look Nicer with CSS

Standard HTML lists are usually pretty boring - a few indented lines with bullets or numbers down the left side. However, with the power of CSS, you can really get creative with your lists! Read on for details...

Controlling indentation

CSS allows you to have more control over the level of indentation of the list items. This is great for those times when your lists start veering across the page, ruining the nice, perfectly-aligned look of your design.

You can adjust the amount of indentation that a list uses by setting both the margin-left and padding-left properties for the ul selector. For example:

ul
{
margin-left: 0;
padding-left: 0;
}

Note that you have to specify both margin-left and padding-left for this to work properly across all browsers.

So let's create a simple list inside a dark rectangle:

<div style="background-color: #3C8B8B">
<ul style="margin-left: 0; padding-left: 0;">
<li>Rover the dog</li>
<li>Fluffy the cat</li>
<li>Jack the rabbit</li>
</ul>
</div>

This will produce the following list:

  • Rover the dog
  • Fluffy the cat
  • Jack the rabbit

The trouble is - our list bullets are outside the rectangle - invisible even, on some browsers! This is because, by default, a list item's bullet is outside the list item's CSS box. We can fix this problem by adding a bit of padding to the list:

<ul style="margin-left: 0; padding-left: 30px;">

This produces the following effect:

  • Rover the dog
  • Fluffy the cat
  • Jack the rabbit

That's more like it! So now we can control exactly how far our lists indent, for example:

<ul style="margin-left: 0; padding-left: 5px;">
  • Rover the dog
  • Fluffy the cat
  • Jack the rabbit

Using different bullets

Another great thing you can do with CSS is change the style of bullets. This is achieved using the list-style-type property. For example, to change the bullets to squares:

<ul style="list-style-type: square;
margin-left: 0; padding-left: 30px;">
  • Rover the dog
  • Fluffy the cat
  • Jack the rabbit

There are also many types of numbering systems you can use for numbered lists. For example:

list-style-type: lower-roman;
  • Rover the dog
  • Fluffy the cat
  • Jack the rabbit
list-style-type: lower-alpha;
  • Rover the dog
  • Fluffy the cat
  • Jack the rabbit
list-style-type: decimal-leading-zero;

(Only works on some browsers)

  • Rover the dog
  • Fluffy the cat
  • Jack the rabbit

For a full list of bullet types that you can use in lists, see the W3C CSS Spec.

Using images for bullets

You can even use images for list bullets!

list-style-image: url("images/smiley.gif");
  • Rover the dog
  • Fluffy the cat
  • Jack the rabbit

Inline lists

Another really useful thing you can do with CSS is create inline lists, using display: inline. For example:

ul, li
{
display: inline;
}
  • Rover the dog
  • Fluffy the cat
  • Jack the rabbit

Now that the list is not constrained to being displayed in a vertical row, you have a lot more control over the layout. For example, by adding in a few borders and background colours, you can give the list items a "button" effect:

ul, li
{
display: inline;
}
li
{
border: solid 1px white;
padding: 5px;
margin: 5px;
background-color: #339999;
}

You can see that, while the basic HTML for our list has remained the same throughout this tutorial, we have managed to change the look of the list fairly radically through the use of CSS. Pretty cool!

This has hopefully given you a taste of some of the neat things you can do with CSS and lists. For more info on formatting lists with CSS, see the W3C Specification.

The End

That's the end of this tutorial. We hope you found it useful. If you're still stuck and would like further help, check out our online Help Forums, where you can get assistance from members of my and other webmasters.

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is the distance between the elements. Figure 8-21provides two concrete examples.

Figure 8-21

Figure 8-21. Examples of negative vertical margins

You'll notice the "pulling" effect of negative topand bottom margins. This is really no different from the way in whichnegative horizontal margins cause an element to push outside of itsparent. Consider:

DIV {width: 400px; border: 1px solid black;}
negative margins on floats somewhat limited. Hanging floats are
probably fairly safe, but trying to push an element upward on the
page is a generally bad idea.

There is one other way for a floated element to exceed its parent's inner left and right edges, and that's when the floated element is wider than its parent. In that case, the floated element will simply overrun the right or left inner edge -- depending on which way the element is floated -- in its best attempt to display itself correctly. This will lead to a result

WARNING

Note that none of this applies to table elements. CSS2 introduces new properties and behaviors for handling tables and table content, and these new features behave in ways fairly distinct from either block-level or inline formatting. See Section 10.1, "Changes from CSS1" for an overview.

8.4.1. Line Layout

8.4.2.1. Generating a line box

Here arethe steps a user agent has to go through in order to generate a linebox. First, for each inline nonreplaced element (or string of textoutside of an inline element), the font-size isused to determine the initial content-height.Thus, if an inline element has a font-size of15px , then the content-height starts out as floated so far up that it intrudes into a paragraph that has alreadybeen displayed by the user agent.

In this case, it's up to the user agent, but the CSSspecifications explicitly state that user agents are not required toreflow previous content to accommodate things that happen later inthe document. In other words, if an image is floated up into aprevious paragraph, it may simply overwrite whatever was alreadythere. On the other hand, the user agent may handle the situation byflowing content around the float, even though doing so isn't