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  Tutorial: CSS CSS CSS Layers Tutorial

With CSS, it is possible to work with layers: pieces of HTML that are placed on top of the regular page with pixel precision.

Tutorial Details:

CSS CSS CSS Layers Tutorial
To create a layer all you need to do is assign the position attribute to your style. The position can be either absolute or relative .

The position itself is defined with the top and left properties.
F inally, which layer is on top is defined with the z-index attribute.

You can either position your layer calculated from the upper left corner(absolute) or calculated from the position where the layer itself is inserted (relative).

If you define the position to be absolute it will be calculated from the upper left corner of the page - unless the layer is defined inside another layer, in which case it will be calculated from the upper left corner of the parent layer.

If you define the position to be relative it will be relative to the position of the tag that carries the style. That is, if you add a relatively positioned layer in the middle of the page, then the position will be calculated from that exact spot in the middle of your page where it was added.

While the position property indicates the out spring of our coordinate system, the left and top properties defines the exact position of our layer. You can enter both positive and negative values for these properties - thus it is possible to place content higher up and further to the left on the page than the logical position in the HTML code where the layer itself is defined. In other words: at the bottom of your HTML code you can enter the code for a layer that is positioned at the top of the resulting page.


 

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