Meta標(biāo)籤主要用於提供網(wǎng)頁的結(jié)構(gòu)化元數(shù)據(jù)，被瀏覽器、搜索引擎和社會化媒體平臺用來理解和處理頁面。 1. 在SEO方面，meta標(biāo)籤如<meta name="description">幫助搜索引擎理解頁面內(nèi)容並影響點擊率，而<meta name="robots">控制是否索引頁面，<meta charset="UTF-8">確保字符編碼正確；2. 在社交媒體分享時，Open Graph和Twitter Cards等meta標(biāo)籤控制鏈接預(yù)覽的外觀；3. 在瀏覽器行為控制方面，viewport標(biāo)籤優(yōu)化移動設(shè)備上的顯示效果，其他標(biāo)籤可定義頁面緩存和展示方式?？傊?，meta標(biāo)籤是網(wǎng)站與外部系統(tǒng)通信的重要工具。

Meta tags in the HTML section are mostly used to provide structured metadata about a webpage. This data isn't visible on the page itself but is used by browsers, search engines, and other services to understand and handle the page appropriately.

Here's how they're typically used:

1. SEO and Search Engine Visibility

One of the main purposes of meta tags is to help with search engine optimization (SEO). Tags like <meta name="description"> give search engines a summary of what the page is about, which can appear in search results. A well-written meta description can influence whether someone clicks through to your site.

Another example is the <meta name="keywords"> tag, though it's no longer used by most major search engines for ranking purposes. Still, some smaller search platforms may reference it.

You might also see tags like:

• <meta name="robots"> – tells search engines whether to index or follow links on the page
• <meta charset="UTF-8"> – ensures proper character encoding so search engines and browsers interpret text correctly

These small details help determine how your page appears and behaves in search results.

2. Social Media Sharing Behavior

When you share a link on social media platforms like Facebook, Twitter, or LinkedIn, those sites often look at special meta tags to decide how to display the preview.

For example:

• Open Graph tags ( <meta property="og:title"> , <meta property="og:image"> ) control how content looks when shared on Facebook
• Twitter Cards ( <meta name="twitter:title"> , <meta name="twitter:card"> ) do something similar for tweets

Without these tags, the preview might pull in random images or text from your page, which could look messy or unprofessional. Adding them gives you more control over how your content appears when shared online.

3. Controlling Browser and Device Behavior

Some meta tags affect how browsers or devices render your page. The most common one today is the viewport meta tag:

 <meta name="viewport" content="width=device-width, initial-scale=1">

This tag helps mobile browsers scale your page properly for different screen sizes. Without it, mobile users might see a zoomed-out version of your desktop site, making it hard to read or interact with.

There are also less commonly used tags that tell browsers not to cache a page or define how pages should be displayed in certain environments (like mobile apps or embedded contexts).

In short, meta tags are tools for communication — between your website and external systems like search engines, social networks, and browsers. They don't change what users see, but they shape how your page is interpreted and handled behind the scenes.

基本上就這些。

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