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Opening a new era of CSS3 programming: mastering the interesting uses of is and where selectors

王林

Sep 09, 2023 am 08:15 AM

cssis selectorwhere selector

Opening a new era of CSS3 programming: mastering the interesting uses of is and where selectors

Open a new era of CSS3 programming: Master the interesting usage of is and where selectors

In CSS programming, selectors are a very important part, it can help us accurately Control the style of web page elements. However, in CSS3, some interesting and powerful selectors have been added, such as the is and where selectors, which bring a new experience to our programming.

The is selector is a new feature in CSS3 that allows us to select elements based on their type and attribute matching. For example, if we want to select all input elements with type "checkbox" and class "form-control", we can use the following code:

input:is([type="checkbox"].form-control) {
  /* 这里是样式代码 */
}

In the above code, we use the attribute selector and The is selector selects input elements with type "checkbox" and class "form-control" respectively. This way, we can set specific styles for these elements.

Another interesting selector is the where selector. It is similar to the is selector, but conditions can be combined using logical operators. For example, if we want to select all elements whose attribute names start with "w-" and whose attribute values end with "red", we can use the following code:

:where([name^="w-"][name$="red"]) {
  /* 这里是样式代码 */
}

In the above code, we use the attribute name Conditions starting with "w-" and attribute values ending with "red" are combined using logical operators to select elements. In this way, we can style elements more flexibly.

In addition to the is selector and where selector, CSS3 also introduces some other selectors, such as the :has selector and the :matches selector, which can also bring more convenience and convenience to our programming. creativity.

In general, CSS3 selectors give us more flexibility and creativity, allowing us to more conveniently control the style of web page elements. They allow us to write more concise and efficient code, and can be applied in a variety of different scenarios. By mastering the usage of these selectors, we can improve our CSS programming level and bring more possibilities to web development.

I hope this article will be helpful to your study and work, and I wish you go further and further on the road of CSS3 programming!

Code example:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS3选择器示例</title>
  <style>
    input:is([type="checkbox"].form-control) {
      /* 设置样式 */
      border: 1px solid red;
      padding: 10px;
    }

    :where([name^="w-"][name$="red"]) {
      /* 设置样式 */
      background-color: red;
      color: white;
    }
  </style>
</head>
<body>
  <form>
    <input type="text" class="form-control">
    <input type="checkbox" class="form-control">
    <input type="checkbox">
    <input type="text" name="w-red" value="example">
    <input type="text" name="w-blue" value="example">
  </form>
</body>
</html>

In the above example code, we define the styles of two selectors, giving specific effects to the corresponding elements. By modifying and debugging this code, you can better understand and apply the interesting uses of the is and where selectors. Happy coding!

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