Understanding Style Sheets (part 2) - The View From The Top (Page 7 of 8 )
Perhaps one of the best things about CSS is the fact that, for the first time, a Web developer has the ability to precisely position different HTML elements on a Web page. The three properties that allow you to do this are "position", "left" and "top" - remember them, because you're going to be using them very, very often in your CSS endeavours!
The "position" property allows to you to define the type of positioning for an element - options are "absolute" or "relative". This property is used in tandem with the "top" and "left" properties, which specify the top and left coordinates for the element under consideration.
Absolute positioning allows you to place an element anywhere on a page, with no regard to the positions of the elements around it, while relative positioning allows you to specify position relative to other elements on the page. Of the two, absolute positioning is more common, since it's easier to specify an absolute location (which remains unchanged) than a relative location (which can change as the elements around it shift position).
Here's an example of how you can use these properties to precisely position blocks of text:
<HTML>
<HEAD>
</HEAD>
<BODY>
<DIV STYLE="position: absolute;
top:10; left:50; font-family: Verdana;
font-size: 35pt; color: green">
Q. How
many Sicilians does it take to change a lightbulb?
</DIV>
<DIV STYLE="position:
absolute; top:140; left:300; font-family: Verdana;
font-size: 20pt; color: blue">
A.
Two. One to change it, and
</DIV>
<DIV STYLE="position: absolute; top:180;
left:50; letter-spacing:5px;
font-family: Verdana; font-size: 33pt; color: red">
one
to kill the witnesses.
</DIV>
</BODY>
</HTML>.
You can also make certain elements invisible with the "visibility" property,
which accepts the values "visible" and "hidden" - take a look:
<HTML>
<HEAD>
</HEAD>
<BODY>
<DIV STYLE="position: absolute;
top:10; left:50; font-family: Verdana;
font-size: 35pt; color: green">
Q. How
many Sicilians does it take to change a lightbulb?
</DIV>
<DIV STYLE="visibility:
hidden">
A. Two. One to change it, and
</DIV>
<DIV STYLE="position: absolute;
top:180; left:50; letter-spacing:5px;
font-family: Verdana; font-size: 33pt; color:
red">
one to kill the witnesses.
</DIV>
</BODY>
</HTML>
Next: The Z-Factor >>
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