mark標(biāo)簽在HTML中的主要用途是突出顯示文檔中相關(guān)或重要的文本。1.最常見的用途是在搜索結(jié)果頁中高亮匹配的關(guān)鍵詞，幫助用戶快速定位內(nèi)容；2.也可用于強(qiáng)調(diào)上下文中的關(guān)鍵信息，如定義、警告或重復(fù)出現(xiàn)的主題；3.可通過CSS自定義樣式，默認(rèn)以黃色背景展示；4.使用時(shí)需注意避免僅依賴顏色傳遞含義、不過度使用、不影響屏幕閱讀器等輔助工具；5.不應(yīng)用于純裝飾性目的，其他情況應(yīng)選擇更合適的標(biāo)簽如del、ins、strong或span。

The mark tag in HTML is used to highlight or mark text that's relevant or important within a document. It’s especially useful when you want to draw attention to certain parts of the content, like search results, key terms, or annotations.

Highlighting Search Results

One of the most common uses of the mark tag is in search result pages. When someone searches for a term on a website, the matching keyword in the result snippet is often wrapped in <mark></mark> to make it stand out visually.

For example:

<p>Here is the result for your query: This is a <mark>sample</mark> page.</p>

This helps users quickly locate their search term without having to scan through all the text manually.

Some typical scenarios:

• A blog post highlights keywords from a site search
• Documentation sites use it to emphasize terms in a glossary
• E-commerce product listings may mark matched attributes like color or size

Browsers usually style it with a yellow background by default, but you can customize the appearance using CSS.

Emphasizing Key Information

Another good use is to bring attention to specific parts of a document — not necessarily because of a search, but because they’re contextually important.

Think of a long article where a particular phrase needs to be called out, like a definition, a warning, or a recurring theme. The mark tag can help make those moments pop without changing the meaning of the sentence.

A few examples:

• Marking a new term introduced in a tutorial
• Showing changes in a versioned document
• Calling out names or places in a narrative

It’s different from other emphasis tags like <strong> or <em>, which imply importance or stress. The mark tag is more about visual noticeability than semantic weight.

Styling and Accessibility Considerations

While the default look of the mark tag is a yellow highlight, you're not stuck with that. You can easily change its appearance with CSS to match your design system.

For instance:

mark {
  background-color: #ffdd57;
  padding: 2px 4px;
  border-radius: 3px;
}

But keep accessibility in mind:

• Don’t rely solely on color to convey meaning
• Avoid overusing it — too many highlights reduce effectiveness
• Make sure it doesn’t clash with screen readers or other assistive tools

Also, avoid using mark for purely decorative purposes. Its intended use is functional — to mark something worth noticing.

When Not to Use the Mark Tag

Just because it looks nice doesn’t mean it should be used everywhere. There are cases where other tags are better suited:

• If you want to indicate deleted or inserted text, go with <del></del> or <ins></ins>
• For bold or emphasized text, stick with <strong> or <em>
• If you just need a styled span, use <span></span> with a class instead

The mark tag should serve a clear purpose, such as highlighting relevance or drawing attention intentionally — not just for decoration.

基本上就這些。

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