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CSS Image Opacity Transparency

Note: This is not yet a CSS standard. However, it works in all modern browsers, and is a part of the W3C CSS 3 recommendation.

Example 1 - Creating a Transparent Image

First we will show you how to create a transparent image with CSS.

Regular image:

The same image with transparency:

Look at the following source code:

<img src="klematis.jpg" width="150" height="113" alt="klematis" style="opacity:0.4;filter:alpha(opacity=40)" />

Firefox uses the property opacity:x for transparency, while IE uses filter:alpha(opacity=x).

Tip: The CSS3 syntax for transparency is opacity:x.

In Firefox (opacity:x) x can be a value from 0.0 - 1.0. A lower value makes the element more transparent.

In IE (filter:alpha(opacity=x)) x can be a value from 0 - 100. A lower value makes the element more transparent.

Example 2 - Image Transparency - Mouseover Effect

Mouse over the images:

The source code looks like this:

<img src="klematis.jpg" style="opacity:0.4;filter:alpha(opacity=40)" onmouseover="this.style.opacity=1;this.filters.alpha.opacity=100" onmouseout="this.style.opacity=0.4;this.filters.alpha.opacity=40" /> <img src="klematis2.jpg" style="opacity:0.4;filter:alpha(opacity=40)" onmouseover="this.style.opacity=1;this.filters.alpha.opacity=100" onmouseout="this.style.opacity=0.4;this.filters.alpha.opacity=40" />

We see that the first line of the source code is similar to the source code in Example 1. In addition, we have added an onmouseover attribute and an onmouseout attribute. The onmouseover attribute defines what will happen when the mouse pointer moves over the image. In this case we want the image to NOT be transparent when we move the mouse pointer over it.

The syntax for this in Firefox is: this.style.opacity=1 and the syntax in IE is: this.filters.alpha.opacity=100.

When the mouse pointer moves away from the image, we want the image to be transparent again. This is done in the onmouseout attribute.

• Introduction to CSS
• CSS Syntax
• CSS How To
• CSS Background
• CSS Text
• CSS Font
• CSS Border
• CSS Outlines
• CSS Margin
• CSS Padding
• CSS List
• CSS Table
• CSS Dimension
• CSS Classification
• CSS Positioning
• CSS Pseudo classes
• CSS Pseudo elements
• CSS Image Gallery
• CSS2 Media Types
• CSS Don't
• You Have Learned CSS, Now What

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