What is the importance of global attributes in HTML?

htmlThe role of global attributes is to provide some common attributes for elements that can be used for any element, not just specific elements. Global properties can be used to control the behavior and style of elements, making web development more convenient and flexible.

The following are the functions of several common html global attributes and specific code examples:

1. class attribute: used to specify one or more class names for elements so that they can be passed through CSS Style sheets to control the styling of elements. Multiple class names can be separated by spaces.

Code example:

<p class="header title">Hello, World!</p>

2. id attribute: Specifies a unique identifier for an element that can be used to manipulate the element in JavaScript. The id attribute value should be unique throughout the document.

Code example:

<div id="container">
   <p>Hello, World!</p>
</div>

3. style attribute: Specify an inline style for the element. You can set the CSS style directly on the element. This style will override the external style sheet. style.

Code example:

<p style="color: red; font-size: 16px;">Hello, World!</p>

4. title attribute: Provides a prompt information for the element, which is displayed when the mouse hovers over the element. Mainly used to provide more information to enhance user experience.

Code example:

<p title="这是一个示例">Hello, World!</p>

5. data-*Attribute: used to store custom data, which can be accessed and manipulated in JavaScript through the dataset attribute.

Code example:

<p data-name="John" data-age="25">Hello, World!</p>

Here are just some commonly used html global attributes and their functions. In fact, there are more global attributes that can be used. By using these global properties flexibly, you can add more functionality and interactivity to web page elements. In the actual web development process, selecting appropriate global attributes according to needs can greatly improve development efficiency.

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