Common CSS selector wildcard examples to master

To master common CSS selector wildcard examples, specific code examples are required

CSS selectors are a very important part of web development. It allows us to customize the Element attributes select and style HTML elements. Among CSS selectors, wildcards are a very useful selector that can match any type of HTML element. In this article, we will introduce commonly used CSS wildcards and provide specific code examples.

1. Wildcard (*)

The wildcard “*” represents selecting all HTML elements. It can be used to set global styles, or in some cases to select specific elements.

Code example:

/*选择所有的HTML元素并设置字体颜色为红色*/
* {
  color: red;
}

2. Type selector (element)

Type selector refers to a method that uses HTML tag names as selectors . Usually used to select a certain type of HTML element.

Code example:

/*选择所有的段落元素（<p>）并设置字体大小为16像素*/
p {
  font-size: 16px;
}

3. ID selector (#id)

ID selector refers to using the ID attribute of the HTML element as the selector a way. The ID attribute is unique and can only be used once in an HTML document.

Code example:

/*选择id为“myDiv”的元素并设置背景颜色为蓝色*/
#myDiv {
  background-color: blue;
}

4. Class selector (.class)

The class selector refers to using the class attribute of the HTML element as the selector a way. An HTML element can use multiple classes, and classes can be reused in multiple HTML elements.

Code example:

/*选择class为“myClass”的元素并设置字体样式为斜体*/
.myClass {
  font-style: italic;
}

5. Attribute selector ([attribute])

The attribute selector refers to using the attributes of the HTML element as the selector a way. Use attribute selectors to select HTML elements with specific attributes.

Code example:

/*选择具有src属性的图像元素，并设置边框为1像素实线*/
img[src] {
  border: 1px solid;
}

6. Attribute value selector ([attribute=value])

The attribute value selector refers to selecting a specific attribute value HTML element. Elements can be selected by a combination of attribute name and attribute value.

Code example:

/*选择所有href属性值为“https://example.com”的链接元素并设置颜色为绿色*/
a[href="https://example.com"] {
  color: green;
}

7. Descendant selector (ancestor descendant)

The descendant selector is used to select descendant elements of an element. Descendant elements can be elements nested inside other elements.

Code example:

/*选择ul元素内的所有li元素并设置字体粗体*/
ul li {
  font-weight: bold;
}

8. Adjacent selector (prev next)

The adjacent selector is used to select the element immediately after another element element. The selected element must have the same parent element as the previous element.

Code examples:

/*选择紧接在h1元素后的p元素并设置颜色为红色*/
h1 + p {
  color: red;
}

The above are examples of commonly used CSS selector wildcards. I hope these specific code examples can help you better understand how to use CSS selectors. Whether you are selecting global elements or selecting elements based on specific attribute values, mastering these selectors will make your web development work more efficient.

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