Uncovering the secrets of HTML5 selectors: Dive into the unique characteristics of each selector

HTML5 Selector Revealed: To understand the uniqueness of each selector, specific code examples are needed

With the development and popularity of HTML5, use selectors to The need to manipulate web page elements is becoming increasingly important. Selectors are a part of CSS that are used in HTML to determine the elements to which styles should be applied. In this article, we will demystify the various selectors in HTML5 and provide practical code examples to illustrate their usage and characteristics.

In HTML5, we have a variety of selectors available. Each selector has its own unique way of positioning elements within a web page. Let’s learn how to use each selector one by one.

1. Element Selector
   The element selector is one of the most basic and commonly used selectors. It selects a specific element by specifying its tag name. For example, to select all paragraph elements, you can use the p selector.

Code example:

p {
    color: red;
}

2. Class Selector (Class Selector)
   The class selector allows us to select elements by specifying the class attribute value of the element. To select all elements with the same class, use a period (.) followed by the class name.

Code example:

.my-class {
    background-color: yellow;
}

3. ID Selector (ID Selector)
   The ID selector selects a single element by specifying the id attribute value of the element. To select an element with a specific id, you can use the pound sign (#) followed by the id name.

Code example:

#my-id {
    font-size: 20px;
}

4. Attribute Selector (Attribute Selector)
   The attribute selector allows us to select elements with specific attributes or attribute values. Property values ​​can be specified using square brackets ([]) and the equal sign.

Code example:

a[href="http://www.example.com"] {
    text-decoration: none;
}

5. Child Selector (Child Selector)
   The child selector allows us to select elements that are direct children of an element. It uses the greater than sign (>) to indicate selection of child elements.

Code example:

div > p {
    color: blue;
}

6. Descendant Selector (Descendant Selector)
   The descendant selector allows us to select any descendant element inside an element. It uses spaces to indicate selection of descendant elements.

Code example:

div p {
    font-style: italic;
}

7. Adjacent Sibling Selector (Adjacent Sibling Selector)
   The Adjacent Sibling Selector allows us to select the element immediately following it sibling elements. It uses the plus sign ( ) to indicate the selection of adjacent sibling elements.

Code examples:

h2 + p {
    font-weight: bold;
}

Through these specific code examples, we can have a clearer understanding of the usage and characteristics of various selectors in HTML5. The flexible use of selectors can help us locate and operate elements in web pages more conveniently, making web development more efficient.

To sum up, element selector, class selector, ID selector, attribute selector, child selector, descendant selector and adjacent sibling selector are the most commonly used selectors in HTML5. By gaining a deeper understanding of what makes each selector unique, we can more accurately select and style the elements we want.

I hope that through the introduction of this article, readers will have a more comprehensive understanding of HTML5 selectors and be able to make full use of the advantages of these selectors in actual web development. Let’s master the skills of using HTML5 selectors together and create better web pages!

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