158) for more information on IE and layout, and
other properties that cause an element to gain a layout.
As we saw in Vendor-specific Properties (p. 367), the Alpha filter21 is a popular filter
that can be used to control the opacity levels of elements in Internet Explorer. The
20 http://msdn2.microsoft.com/en-us/library/ms532847.aspx
21 http://msdn2.microsoft.com/en-us/library/ms532967.aspx
The Ultimate CSS Reference 382
AlphaImageLoader22 is another popular filter which can be used to provide support
for PNG (Portable Network Graphic)23 transparency in IE5.5 and IE6 (IE7 already
offers native support for PNG transparency). IE6 and earlier versions don??™t natively
support alpha transparency (partial levels of transparency)??”they support only
binary transparency, where pixels are either fully opaque or fully transparent.
The AlphaImageLoader filter will display an image within an element between that
element??™s background and its content. The filter doesn??™t have the same features as
CSS background images, so its use is limited: you will be able to stretch or shrink
the image, crop the image, or leave the image at its initial size, but you won??™t be
able to specify the equivalent of background-repeat or background-position for
it.
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