A peek into the future: Looking ahead to CSS3 programming trends and the future of is and where selectors

Peeping into the future: Looking forward to CSS3 programming trends and the prospects of is and where selectors

Introduction:
With the continuous development of the Internet, the design and development of web pages It is also constantly evolving. As a web developer, it is crucial to understand and stay on top of the latest technology trends. As an important part of front-end development, CSS3 is also constantly developing and improving. This article will preview the trend of CSS3 programming, focus on the is and where selectors, and provide readers with practical code examples.

1. Prospects for CSS3 programming trends

1. The popularity of responsive design
   With the popularity of mobile devices, responsive design has become an important trend in today's web development. The powerful functions of CSS3 provide more possibilities for responsive design, such as media queries, media types, etc., and can adaptively present web page content according to different devices.
2. The rise of animation effects
   In the past, the presentation of web pages was only static text and images, but now the emergence of CSS3 animation effects makes web pages more lively and interesting. With the help of transition and animation attributes, developers can create a variety of dynamic effects to make the page more attractive.
3. Application of custom fonts
   The @font-face attribute in CSS3 allows web developers to customize fonts, which brings more creative and personalized choices to web design. Developers can select and embed their favorite fonts to give web pages a unique visual effect.

2. The prospect of is and where selectors

1. is selector
   is selector is one of the new features of CSS3, which allows developers to use concise Clear syntax for selecting a specific state of an element. Compared with traditional selectors, the is selector is more flexible and easier to understand, making style selection more precise. The following is a sample code of the is selector:

input:not(:focus):is([type="text"],[type="password"]) {
  background: lightgreen;
}

The above code indicates that the input elements except the text and password types that are in focus are selected and a background color of light green is applied to them. style.

2. where selector
   The where selector is another new feature of CSS3. It is similar to the is selector and allows developers to use more intuitive syntax and logical expressions to select elements. The where selector can use logical operators (such as and, or) to combine multiple conditions to select elements. The following is an example code of a where selector:

:nth-child(odd) where (:not(p)) {
  background: lightblue;
}

The above code means to select elements at odd positions and whose tag names are not p, and apply a background color of light blue to them style.

3. Code Example
The following is a code example that combines is and where selectors to implement a responsive web navigation bar:

<nav>
  <ul>
    <li><a href="#">首页</a></li>
    <li><a href="#">关于</a></li>
    <li><a href="#">服务</a></li>
    <li><a href="#">联系我们</a></li>
  </ul>
</nav>

<style>
/* 响应式导航栏样式 */
nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: lightgray;
}
nav ul li {
  float: left;
}
nav ul a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-weight: bold;
}

/* is与where选择器应用 */
nav ul li:is(:hover, :active):where(:not(:first-child)) {
  background-color: darkgray;
}
</style>

In the above code, through is Selector and where selector, when the mouse hovers or clicks on the option in the navigation bar (except the home page), a style with a dark gray background color is applied to achieve a more interactive effect.

Conclusion:
As a web developer, it is very important to understand and master the trend of CSS3 programming. This article previews the trends in CSS3 programming and focuses on the prospects of the is and where selectors. Through code examples, readers can better understand and apply these two selectors to create more cool web page effects that are suitable for different devices. I hope this article will inspire and help readers.

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