From http://www.w3schools.com (Copyright Refsnes Data)

CSS left Property

Definition

The left property specifies the left edge of an element.

Note: If the "position" property has a value of "static", the "left" property has no effect.

Inherited: No

CSS properties can also be dynamically changed with a JavaScript.

Scripting Syntax: object.style.left="100px"

In our HTML DOM tutorial you can find more details about the left property.

In our HTML DOM tutorial you can also find a full Style Object Reference.

This example sets the left edge of the paragraph 20 px to the right of the left edge of the window:
p
{
position: absolute;
left: 20px
}

This example sets the left edge of the paragraph 20 px to the left of the left edge of the window:
p
{
position: absolute;
left: -20px
}

Value	Description
auto	Default. Lets the browser calculate the left position
%	Sets the left position in % from the left edge of the window
length	Sets the left position in px, cm, etc. from the left edge of the window. Negative values are allowed

Set the left edge of an image using a pixel value
This example demonstrates how to set the left edge of an element using a pixel value.

Set the left edge of an image using a percent value
This example demonstrates how to set the left edge of an element using a percent value.

Z-index
Z-index can be used to place an element "behind" another element.

Z-index
The elements in the example above have now changed their Z-index.