標(biāo)籤用於在HTML中創(chuàng)建水平分隔線，充當(dāng)內(nèi)容區(qū)塊間的視覺分隔符；1. 它表示主題性分隔，通常顯示為橫貫頁面的直線；2. 用法簡單，直接插入所需位置，無需閉合；3. 可通過CSS自定義樣式，如顏色、高度和間距；4. 適用於分隔段落、表單區(qū)域或文檔章節(jié)，但應(yīng)避免過度使用以免頁面雜亂；5. 使用時建議重置默認(rèn)邊框以確保樣式統(tǒng)一。

The<hr> element in HTML is used to create a horizo??ntal rule, which acts as a visual separator between sections of content. It's a simple but effective way to divide different parts of a webpage without using CSS borders or dividers.

What Does the<hr> Tag Do?

The<hr> tag stands for "horizo??ntal rule," and it inserts a thematic break in your HTML document — typically displayed as a straight line across the page. Browsers usually render it as a thin horizo??ntal line that stretches the width of its container, though you can customize its appearance with CSS.

This tag is often used to separate paragraphs, form sections, or distinct blocks of content, such as between blog posts or after a header section.

How to Use the<hr> Tag

Using<hr> is straightforward — just place it where you want the break to appear:

 <p>First paragraph of content.</p>
<hr />
<p>Second paragraph, separated by a horizo??ntal line.</p>

You don't need to close the<hr /> tag because it's a self-closing element (though in HTML5, you can write it either way:<hr /> or<hr /> ).

Here are a few tips:

• Place it between sections to visually separate them
• Avoid overusing — too many lines can make a page look cluttered
• You can style it using CSS if the default look doesn't fit your design

Styling Horizo??ntal Rules with CSS

By default, browsers apply some basic styles to<hr /> , like a light gray line and some margin. But you can override these to match your site's theme.

For example, here's how you might change the color, height, and spacing:

 hr {
  border: none;
  height: 2px;
  background-color: #333;
  margin: 30px 0;
}

You can also add more visual flair:

• Use gradients for a modern look
• Add spacing above and below for better layout flow
• Style it differently based on where it appears on the page

Just remember: once you start styling<hr> , it's best to reset the default border , since browsers may apply their own styles.

When to Use Horizo??ntal Rules

Horizo??ntal rules work well in several situations:

• Separating major sections of a page (like intro text from the main content)
• Dividing form elements into logical groups
• Creating visual breaks in long articles or documentation

They're especially useful when you want a clean, semantic way to show a thematic break without extra divs or CSS tricks. Just keep them consistent in style so they don't distract from the content itself.

基本上就這些。

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