<span style="margin:0;background:#ffff33;font-size:120%;font-weight:bold;border:1px solid #a3b0bf;text-align:left;color:#000;padding:0.2em 0.4em;">This document is a work in progress and is subject to change.</span><br /><br />
== Summary ==
This property sets *Firefox allows you to use coding to manipulate the background image opacity of an element. When setting a background image, authors should also specify a background color that will be used when the image is unavailable. When the image is available, it is rendered on top of the background color. (Thus, *"Opacity" refers to transparency; the color is visible in lesser the transparent parts opacity of the an image). Values for this property are either <uri>, to specify the image, or 'none', when no image more transparent it is used. <pre>BODY { background-image: url("marble.gif") }P { background-image: none }</pre>
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