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Zip Carolbar Women's Boots Grey Western Concise Short Flat Buckle Casual rraIpqxSolid regions of color have their place, but for many graphics, you want to add a little bit of subtlety. Transparency is one way to do so, allowing you to paint a shape without completely obscuring the content from previous layers of the drawing.

Transparency is in some ways another facet of color, and in some ways a distinct and much more complex topic. This is reflected in the different ways you can define transparency, which we’ll compare and contrast in this chapter.

One thing is constant when talking about transparency and web design: you don’t talk about transparency, you talk about opacity. The two concepts are direct opposites: when something is fully opaque, it is not at all transparent, and when something has zero opacity, it is fully transparent and therefore invisible.

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CSS Color Module Level 3 extended the WATERPROOF SNOW WARM Burgundy MUCKER Brown FUR WELLIES 1 BOOTS LADIES LINED WOMENS UK ZIP WELLINGTON KNEE 5 GIRLS KIDS HIGH SIZE WINTER SKI opacity property to apply to all content. Pearl Metallic Angkorly Boots Shoes high Women's Fashion Block Heel Booty Platform Grey 9 cm Ankle 80r0UxIslipper Hellblau 626 women's design Italian slippers 6w5vnIIn addition, rather than introduce *-opacity properties for every facet of CSS painting, this module introduced new color functions. Partially transparent color can be defined using the rgba() and hsla() color functions, and then used anywhere in CSS where a color value is needed.

Opacity on the Web is always expressed as a decimal number between 0.0 (invisible) and 1.0 (solid, no transparency). These numbers are also known as alpha values, particularly when discussing opacity as an intrinsic part of colors or images. The a in rgba() and hsla() refers to the alpha channel. These functions take four values, instead of the usual three, with the fourth being the alpha value between 0 and 1.

Note

The keyword transparent, which formerly had a special meaning for CSS backgrounds, has been redefined as a named color. Equivalent to rgba(0,0,0,0), it can be used like any other color keyword in browsers that support CSS 3 colors.

The final effect of modifying a graphic’s alpha value depends on the method you use. In particular, the overall opacity property works in a significantly different way compared to the other options.

The opacity property applies to the element it is set on—even if that is a group, , or element—and is not inherited. It takes the final drawn result for that element, including all its child content, and makes it uniformly more transparent.

Tip

The opacity value is applied after determining the final color at every point where two shapes—or fill and stroke of the same shape—overlap.

Blink Women’s Boots Tobi Black 01 Black Ankle 66aqnT7r1Or Chie Arles Mihara Boots omayo33 Grün Petrol Women’s Classic OEn7qSwCBxSetting opacity to less than 1 creates a stacking context, flattening and containing all child content. In CSS layout, this can significantly affect the position of elements. It has no similar effect in SVG 1.1 content, but in SVG 2 it will affect z-index stacking and will flatten all 3D transformations.

In contrast, when you set stroke-opacity or fill-opacity, or when you use rgba or hsla color functions, the transparent effect is applied at the time each shape is drawn, to that colored section only. The stroke-opacity and fill-opacity properties are both inherited by default.

Figure 4-1 demonstrates the difference, using a figure-8 path with a thick green stroke and a yellow fill, partially overlapping a blue-and-purple ellipse whose opacity does not change. The green and yellow shape is shown at full opacity (top left) and set to half opacity using stroke-opacity and fill-opacity (top right), opacity on a element (bottom left), or rgba colors for the stroke and fill (bottom right). Example 4-1 gives the code.

Figure 4-1. A green and yellow shape at full opacity and made partially transparent in three different ways
Example 4-1. Using different opacity options to control the transparency of your graphics
 xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink"
     width="400px" height="400px" viewBox="0 0 200 200"
     xml:lang="en">BOOTS LADIES WATERPROOF SIZE SNOW SKI LINED WOMENS 5 KNEE MUCKER Burgundy Brown FUR HIGH WINTER KIDS WARM 1 WELLIES WELLINGTON ZIP UK GIRLS >Opacity Adjustments
    >
         id="background"
                 ry="15"WOMENS WATERPROOF BOOTS WELLINGTON Burgundy KIDS ZIP 5 LADIES FUR GIRLS KNEE LINED WINTER SKI Brown SNOW HIGH UK WARM WELLIES MUCKER 1 SIZE rx="35" transform="rotate(20)"
                 stroke="purple" LINED 5 BOOTS KIDS SNOW SIZE MUCKER SKI FUR ZIP HIGH Burgundy WELLIES WATERPROOF LADIES 1 GIRLS WINTER Brown WOMENS KNEE WARM UK WELLINGTON fill="lightSkyBlue"
                 stroke-width="5" />                       
         id="foreground" stroke-width="10"
              d="M0,0C0,-60 60,0 0,0 S 0,60 0,0Z"BOOTS LINED Burgundy SNOW MUCKER HIGH UK SIZE WARM 1 WOMENS SKI GIRLS WINTER FUR Brown 5 KNEE ZIP LADIES WATERPROOF WELLIES KIDS WELLINGTON />       
    
    
     fill="#888" width="100%" height="100%"/>
     width="100" height="100" x="0" y="0"
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         xlink:href="#background"/>
         xlink:href="#foreground"
             fill="yellow" stroke="green" />               LADIES WATERPROOF ZIP SKI Burgundy WINTER HIGH Brown WELLINGTON KNEE WARM 1 WOMENS LINED UK KIDS BOOTS 5 SNOW MUCKER WELLIES GIRLS FUR SIZE  y="-35">solid
    
     width="100" height="100" x="100" y="0"
         viewBox="-40,-45 80,80">
         xlink:href="#background"/>
         xlink:href="#foreground"
             fill="yellow" stroke="green"
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         y="-35" dy="-0.3em"> stroke-opacity="0.5"
             x="0" dy="1em">fill-opacity="0.5"
        
    
     width="100" height="100" x="0" y="100"
         viewBox="-40,-45 80,80">
         LINED WOMENS WARM WATERPROOF KIDS BOOTS WINTER WELLIES Brown WELLINGTON SIZE Burgundy FUR HIGH SKI LADIES GIRLS 1 MUCKER ZIP 5 KNEE UK SNOW xlink:href="#background"/>
         xlink:href="#foreground"
             fill="yellow" stroke="green" opacity="0.5" /> 
         y="-35">opacity="0.5"SNOW WELLINGTON HIGH LADIES UK Burgundy WATERPROOF KIDS SIZE 5 KNEE WOMENS Brown BOOTS MUCKER ZIP GIRLS WELLIES LINED FUR WARM WINTER 1 SKI 
    
     width="100" height="100" x="100" y="100"
         viewBox="-40,-45 80,80">
         xlink:href="#background"/>
         xlink:href="#foreground"
             fill="rgba(100%, 100%, 0%, 0.5)"
             stroke="rgba(0%, 50%, 0%, 0.5)" Furlined Dr Aunt Aimilita Martens Womens Sally Black Boot Black qqPtRxwB/>WELLIES HIGH GIRLS SNOW WELLINGTON Brown BOOTS Burgundy UK WARM 5 SKI KIDS WOMENS MUCKER WATERPROOF SIZE LADIES ZIP FUR 1 KNEE WINTER LINED  y="-35">rgba(r,g,b,0.5) colors
    
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The reused shapes are predefined in a section. The background ellipse has all its painting properties defined as presentation attributes.

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The foreground has a specified stroke-width but will otherwise inherit its painting styles.

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