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CSS GUIDE -MOZ-OPACITY

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→‎Fun with -moz-opacity

This document is a work in progress and is subject to change.

== Summary ==

*Firefox allows you to use coding to manipulate the opacity of an image.

*"Opacity" refers to transparency; the lesser the opacity of an image, the more transparent it is.

This property sets the background image 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, the color is visible in the transparent parts of the image).

~~Values for this property are either <uri>, to specify the image, or 'none', when no image is used.~~

~~<pre>~~

~~BODY { background-image: url("marble.gif") }~~

~~P { background-image: none }</pre>~~

<tr>

<td>~~Applicability~~Initial Value:</td><td>~~The background-repeat property can be used for all CSS elements.~~1(opaque)</td>

</tr>

<tr>

<td>~~[http://developer.mozilla.org/en/docs/CSS:%40media#Media_groups Media Group:]~~Applies to</td><td>~~Visual~~all elements</td>

</tr>

<tr>

== Syntax ==

~~If a background image is specified, this property specifies whether~~ Opacity:1.0 shows you all of the image ~~is repeated (tiled), and how. All tiling covers~~ ; Without any filters applied the ~~content and padding areas of a box. A value~~ opacity of ~~'repeat' means that the~~ an image is ~~repeated both horizontally and vertically~~1. ~~The 'repeat-x'~~ 0 (~~'repeat-y'~~fully opaque) ~~value makes the image repeat horizontally (vertically), to create a single band of images from one side~~ . We use CSS to define the ~~other. With a value~~ initial degree of ~~'no-repeat', the image is not repeated.~~opacity in Firefox:

<pre>

~~BODY {~~ ~~background~~<IMG style="-moz-opacity: ~~white url(~~0.5" src="~~pendant~~test.gif"); ~~background-repeat: repeat-y;~~ ~~background-position: center;~~}>

</pre>

~~== Legal Values ==The following units are valid~~ Valid range of values for ~~defining background-repeat:~~ *repeat**The image is repeated both horizontally and vertically. *repeat-x**The image is repeated horizontally onlymoz. *repeat-y**The image is repeated vertically only. *no-repeat**The image is not repeated: only one copy of the image opacity is ~~drawn~~from 0 to 1, where lesser equates to more transparency.

== Usage ==

*Quick opacity change onMouseover:

<pre>

</pre>

*For CSS opacity to work in the browser it must have some placement specified. Mozilla recommends that we use float:left; and position:relative; to work in Mozilla Firefox. The opacity code for simply displaying an image is more straightforward.

<pre>

</pre>

==Fun with -moz-opacity==

To make your page more attractive, you can do something like this:

[[Image:Fun stuff.png]]

<pre>

<div style="color:black;width:150px;background:white;filter:alpha(opacity=50);-moz-opacity:.50;

opacity:.50;float:right;margin-top:10px;margin-bottom:10px;margin-left:10px;

font-family:Verdana, Arial, Helvetica,Georgia;font-size: 28px;line-height:26px; text-align: right;">

...this will look like some of the

pullquotes or subtitles we see

in

<span style="width:150px;padding-bottom:10px;float:right;text-align:left;color:black;background:white;

filter:alpha(opacity=25);-moz-opacity:.25;opacity:.25;">magazinelayout...

</div>

</pre>

== Mozilla Recommended Values ==

[http://developer.mozilla.org/en/docs/CSS:~~background~~-~~repeat~~ moz-opacity MDC document on ~~background~~-~~repeat~~moz-opacity]

== Notes ==

The [http://www.w3.org World Wide Web Consortium (W3C)] provides a free online [http://jigsaw.w3.org/css-validator/ CSS validation service].

~~== Specification Conformance ==~~*[http://www.w3.org/TR/REC-CSS1#background-repeat CSS 1 ]*[http://www.w3.org/TR/REC-CSS2/colors.html CSS 2]*CSS 3 (specification not yet published)

== Browser Compatibility ==

Elichak

1

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