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It's still here, the content didn't go anywhere. You may want to check out this new guiStuff though -- It's rather informative.
References/Tutorials:
Intro Documents:
guiStuff:
::Stuff for the multi-spec coder;
Coding, formats, standards, and other practical things.
<!-- CSS 2.1 Reference
Property Name: z-index
Default Value: auto
Inherited: no
Possible values directly from the standard:
auto, integer, inherit
Property Description:
Elements in CSS are layered one on top of each other. This is, in a sense, a z-axis property. If two elements overlap in 2D space, this property will determine which will cover the other. The higher the value, the 'higher' the element is placed (the higher element it rendered on top of the lower one). Negative and zero values are allowed, but not fractions (the value must be an integer). Transparency and translucency are very relevant to this property, as the renderer will take them into account when drawing the elements onto the display device.
Example:
#Box_A
{
z-index: 2;
}
#Above_Box_A
{
z-index: 5;
}
Complete CSS Property Listing:
background-attachment, background-color, background-image, background-position, background-repeat, background, border-collapse, border-color, border-spacing, border-style, border-top, border-right, border-bottom, border-left, border-top-color, border-right-color, border-bottom-color, border-left-color, border-top-style, border-right-style, border-bottom-style, border-left-style, border-top-width, border-right-width, border-bottom-width, border-left-width, border-width, border, bottom, caption-side, clear, clip, color, content, counter-increment, counter-reset, cursor, direction, display, empty-cells, float, font-family, font-size, font-style, font-variant, font-weight, font, height, left, letter-spacing, line-height, list-style-image, list-style-position, list-style-type, list-style, margin-top, margin-right, margin-bottom, margin-left, margin, max-height, max-width, min-height, min-width, outline-color, outline-style, outline-width, outline, overflow, padding-top, padding-right, padding-bottom, padding-left, padding, position, quotes, right, table-layout, text-align, text-decoration, text-indent, text-transform, top, unicode-bidi, vertical-align, visibility, white-space, width, word-spacing, z-index