HTML&CSS · December 20, 2023

Css Basic: fill-opacity

CSS Basics: fill-opacity

CSS (Cascading Style Sheets) is a fundamental technology used for styling web pages. It allows web developers to control the appearance of various elements on a website. One of the properties in CSS is fill-opacity, which is used to control the opacity of the fill color in SVG (Scalable Vector Graphics) elements.

Understanding fill-opacity

In SVG, shapes such as rectangles, circles, and polygons can have a fill color applied to them. The fill-opacity property determines the transparency of this fill color. It accepts values between 0 and 1, where 0 represents complete transparency (invisible) and 1 represents complete opacity (fully visible).

Let's consider an example to understand how fill-opacity works:

<svg width="200" height="200">
  <rect x="50" y="50" width="100" height="100" fill="blue" fill-opacity="0.5"/>
</svg>

In the above code snippet, we have an SVG element with a rectangle shape. The fill attribute sets the fill color to blue, and the fill-opacity attribute sets the opacity to 0.5. As a result, the rectangle will appear as a semi-transparent blue shape.

Applying fill-opacity to SVG Elements

The fill-opacity property can be applied to various SVG elements, including rectangles, circles, ellipses, polygons, and paths. By adjusting the value of fill-opacity, you can create different levels of transparency for these shapes.

For example, let's consider a circle with a fill color of red and an opacity of 0.7:

<svg width="200" height="200">
  <circle cx="100" cy="100" r="50" fill="red" fill-opacity="0.7"/>
</svg>

In this case, the circle will appear as a semi-transparent red shape.

Using fill-opacity with CSS

The fill-opacity property can also be used in combination with CSS to style SVG elements. By applying CSS classes or inline styles, you can control the opacity of SVG shapes dynamically.

For instance, let's define a CSS class called "transparent" that sets the fill-opacity to 0:

.transparent {
  fill-opacity: 0;
}

Now, we can apply this class to any SVG element to make it completely transparent:

<svg width="200" height="200">
  <circle cx="100" cy="100" r="50" fill="blue" class="transparent"/>
</svg>

In the above example, the circle will be invisible due to the fill-opacity value of 0 specified in the "transparent" class.

Summary

In conclusion, the fill-opacity property in CSS allows you to control the transparency of the fill color in SVG elements. By adjusting the value between 0 and 1, you can create various levels of opacity for shapes such as rectangles, circles, and polygons. Understanding and utilizing fill-opacity can enhance the visual appeal of your website's SVG graphics.

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