What is the correct use of the tag?

Correct use of HTML tags can improve structural clarity, readability and SEO effects. 1.

<div> is a block-level element that is suitable for layout and wrapping large segments of content, while <span> is an inline element that is used for small-scale text control or logical structure; common mistakes include using <div> where it should not be broken or abused and ignoring semantic tags such as <header> and <main>. 2. The form should bind the id of <label> and <input> through the for attribute to improve interaction and barrier-free experience, or nest <input> in <label> and omit the attribute association. 3. must write alt attribute to replace display and accessibility. Decorative images can set empty values but attributes cannot be omitted; common misunderstandings include replacing specific semantics with file names or fuzzy descriptions.

The correct use of HTML tags is actually not a profound technology, but many people ignore some details when writing web pages, resulting in confusion in structure, poor readability and even affecting SEO. If you want to write a standardized and practical HTML page, it is the key to understand the role of common tags and the correct usage.

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1. <div> and <code><span></span> : The difference between block-level and line content

<div> is a block-level element that will occupy a single line by default, suitable for wrapping a large piece of content or as a layout container; while <code><span></span> is an inline element, usually used for small-scale text style control or inserting a small piece of logical structure.

For example, you have a paragraph of text, and several words need to be processed specifically:

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 <p>This is a common paragraph of text, in which "certain words" are emphasized. </p>

If you just bold or change the color here, it is enough to use <span> ; but if you want to set a separate block, such as a section of introduction information, it is more suitable to use <div> or more semantic tags such as <section> .

Common errors:

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• Use <div> in places where it shouldn't be broken
• Use <div> to stack up the entire page structure, ignoring more meaningful tags (such as <header> , <main> , <footer> )

2. How to associate <label> and <input> in the form

Many people directly put <input> when writing a form, without adding <label> or simply putting a for attribute. As a result, users cannot focus on the input box when clicking on label. The correct way is to bind the label and input ids through the for attribute:

 <label for="username">Username:</label>
<input type="text" id="username" name="username">

This is not only mouse user-friendly, but also improves the experience of auxiliary tools such as screen readers.

Another tip:
If you put <input> in <label> , you can also not write for and id:

 <label>
  Remember me <input type="checkbox" name="remember">
</label>

Although this method is easy to use, you need to pay attention to whether the nested structure will affect the style layout.

3. The image tag <img src="/static/imghw/default1.png" data-src="photo.jpg" class="lazy" alt="What is the correct use of the tag?" > must have the alt attribute

The alt attribute in is not optional, but must be written. It has two important functions:

• Display alternative text when image loading fails
• Improve website accessibility and facilitate screen reader recognition

If your image is purely decorative, you can leave alt="" , but you can't omit this attribute.

Common misunderstandings:

• Write alt as file name (for example "banner1.jpg")
• Ignore the semantics of pictures and write them too general (such as just writing "pictures")

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Basically that's it. HTML is not complicated, but many details are easily overlooked, especially those who are just beginning to learn. Pay more attention to the meaning and usage of tags, which can not only write clearer code, but also improve user experience and page performance.