Understand the importance and application of global attributes when parsing HTML

and elements are given unique identifiers using the id attribute. And the corresponding DOM objects are obtained for the container, content and btn variables through JavaScript code. Through these id attributes and corresponding DOM objects, we can easily modify the style and content of elements, and at the same time implement monitoring and processing of button click events.

2. class attribute

The class attribute is used to specify one or more class names for HTML elements. Through class names, we can control the style of a group of elements with similar characteristics, making the code more concise and readable.

<style>
  .red {
    color: red;
  }
  
  .bold {
    font-weight: bold;
  }
</style>

<p class="red">这是一个红色的段落。</p>
<p class="bold">这是一个加粗的段落。</p>
<p class="red bold">这是一个既红色又加粗的段落。</p>

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In the above code, we define two CSS style classes. red and .bold to specify red and bold styles respectively. By applying the class attribute on the

element and specifying the corresponding class name, we can easily control the element style.

3. contenteditable attribute

The contenteditable attribute is used to specify whether the HTML element is editable. By setting it to true or false, we can achieve editable and non-editable states in the web page.

<div contenteditable="true">这是一个可编辑的div。</div>
<p contenteditable="false">这是一个不可编辑的段落。</p>

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In the above code, by setting the contenteditable attribute, we can set the

element to an editable state to modify the content. The

element is set to an uneditable state and its content cannot be modified.

Conclusion

As an indispensable part of HTML development, global attributes have wide applicability and importance. By properly applying global attributes, we can simplify HTML code and improve maintainability and scalability. The id, class, and contenteditable attributes introduced in this article are just the tip of the iceberg of global attributes. There are more and richer global attributes waiting for developers to understand and apply them in depth. I hope this article can provide some inspiration and guidance for readers to analyze the role and application of global attributes in HTML, making web development more efficient and convenient.

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