Explaining the HTML5 `` vs `` elements.

<div> is a block-level element<p> <code><div> is a block-level element by default, which means it will occupy a single line regardless of whether there is content or not. If you set the width, height, inner and outer margins and other styles for it, it will take effect normally.<p> Common usage scenarios: </p> <img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175226098477717.jpeg" class="lazy" alt="Explaining the HTML5 `<article>` vs `<section>` elements."> ` vs `<section> ` elements." /><ul> <li> As a container for page layout</li> <li> Wrap a set of related elements to facilitate unified control of styles or behaviors</li> <li> Responsive design with CSS Grid or Flexbox</li> </ul> <p> For example, you write a piece of code like this:</p><pre class='brush:php;toolbar:false;'> &lt;div class=&quot;box&quot;&gt;This is a div&lt;/div&gt; &lt;p&gt;This is a paragraph of text&lt;/p&gt;</pre><p> This <code>div will start with a new line and fill the width it can occupy.

` vs `

` elements." />

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<span> is an inline element

<span> , on the contrary, it is an inline element. It will not wrap the line, nor will it automatically occupy a whole line, its size depends entirely on the content itself.

Common usage scenarios:

• Add styles to a part of the text, such as highlighting a word
• Dynamically operate a certain text, such as changing the color or content with JavaScript
• Add extra styles or attributes without interrupting text stream

For example:

 <p>This is a normal sentence, but the word <em><span   style="max-width:90%">is red</span></em>. </p>

Here we use <span> to change the color of only one word in the sentence without affecting the structure of the entire paragraph.

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How to choose:

or <span> ?

Simply put, it depends on whether the content you want to package needs to be "individually blocked":

• If it is related to layout and requires independent space, use
• If it is just a small part of the text, use <span>

Other points should be noted:

• <div> cannot be placed in the <code><p></p> tag (HTML specification does not allow it)
• <span> is not suitable for structural layout, otherwise it may disrupt text flow
• Today, with more semantic tags, try to give priority to using more meaningful tags (such as <section></section> , <article></article> , <header></header> , etc.) instead of blindly applying
  or <span>

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  Basically that's it. Although both tags are very basic, using the wrong place may affect layout, accessibility and even SEO. Only by understanding their behavioral differences can we write a clearer and more reasonable HTML structure.