Explore the basic syntax of CSS3

CSS is a style sheet language used for web design. CSS3 is an upgraded version of CSS, providing more styles and special effects. In this article, we will explore how to write CSS3 so that you can better apply it.

1. Selectors

In CSS3, there are many new selectors that can be used to select different HTML elements. These selectors include:

1. Attribute selection

Using attribute selectors, you can select elements based on their attribute values. For example, the following CSS rule will select all elements with the title attribute value "example":

[title=example] {
  color: red;
}

2. Substring match selector

The substring match selector allows you to select A substring in the attribute value selects the element. Here is an example of using * to match elements:

a[href*="example"] {
  color: red;
}

This selects all anchor elements whose href attribute value contains the string "example".

3. Pseudo-element selectors

CSS3 also adds some new pseudo-element selectors, which can add styles to certain parts of the element, such as:

p::first-letter {
  font-size: 200%;
}

p::first-line {
  color: red;
}

The above rule will change the font size of the first letter in the paragraph, as well as the color of the first line of text.

2. New features

CSS3 also provides many new features, including:

1. Rounded corners

border-radius: 50%;

the above The code will make the element have rounded corners.

2. Gradient

Use gradients to add smooth color transitions to elements. Here's an example of using a gradient:

background: linear-gradient(to bottom right, red, yellow);

This will gradient the element's background from the upper left corner to the lower right corner, from red to yellow.

3. Box Shadow

CSS3 also provides new box shadow properties that you can use to add a shadow to an element. For example:

box-shadow: 10px 10px 5px grey;

The above rule will add a shadow to the lower right corner of the element.

4. Transition

Transition effects can make the changes of elements smoother. Here's an example of using a transition:

transition: width 2s;

This makes it take two seconds for the element's width to change from one value to another.

5. Animation

Animation can make elements more interesting and vivid. Here's an example of using animation:

animation: example 5s infinite;

This adds an animation called "example" to the element that lasts 5 seconds and loops forever.

3. Browser compatibility

It should be noted that CSS3 features have different compatibility in different browsers. To ensure that your website works well in all browsers, there are a few tricks you should use to implement browser support.

One solution is to use browser prefixes, adding the -vendor- prefix before CSS properties so that different browsers can correctly parse your code. For example:

-webkit-border-radius: 50%;
-moz-border-radius: 50%;
border-radius: 50%;

You can also use CSS preprocessors such as Sass or Less, which make CSS writing more concise and provide features such as mixins and variables.

In short, CSS3 provides many new features and selectors that can make web design more vivid and interesting. Understanding these new features and writing methods can make your web pages more attractive and provide users with a better experience.

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