HTML：HyperText Markup Language，是一個用來建構網頁結構的一種標籤語法，以下是各版本的發佈年份。
| 年份 | 版本 |
|---|---|
| 1993 | HTML |
| 1995 | HTML 2.0 |
| 1997 | HTML 3.2 |
| 1997 | HTML 4 |
| 1999 | HTML 4.01 |
| 2000 | XHTML |
| 2014 | HTML 5 |
撰寫HTML文件時，第一行可以宣告本文件所採用的版本，例如：
HTML 5
<!DOCTYPE html>
XHTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
HTML 4.01
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
其中XHTML強制每個標籤都要有結束，如果沒有外部封閉標籤的，需使用內部封閉的方式，例如：
外部封閉：<p>內容1</p><p>內容2</p>
內部封閉：內容1<br />內容2
目前大部分的瀏覽器都支援HTML5，但若要IE8以前的瀏覽器支援，請加入下面的語法：
<!--[if lt IE 9]>
<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
想要測試自己的瀏覽器是不是完全支援所有的HTML5標籤，可以到這個網站來測試看看，以下是為大家整理的HTML標籤：
| 標籤 | 說明 | 備註 |
|---|---|---|
| <html></html> | 建構整份網頁文件 | |
| <head></head> | 網頁描述資料 | |
| <body></body> | 網頁內容 |
| 標籤 | 說明 | 備註 |
|---|---|---|
| <title></title> | 網頁標題 | |
| <base> | 連結參考 | 針對相對路徑的參考位置 |
| <meta> | 頁面描述資料 | 關鍵字、描述…等 |
| <style></style> | CSS樣式 | 直接在網頁文件中撰寫CSS樣式 |
| <script></script> | Javascript語法 | 直接在網頁文件中撰寫Javascript樣式 |
| <noscript></noscript> | 不支援語法時顯示訊息 | |
| <link> | 連結外部檔案 | 例如：CSS樣式表、網頁圖示檔…等 |
| 標籤 | 說明 | 備註 |
|---|---|---|
| <h1></h1>～<h6></h6> | 標題 | 數字越小權重越高 |
| <p></p> | 段落 | |
| <br> | 跳行 | |
| <wbr> | 文字過長則斷行 | HTML 5新增 |
| <hr> | 水平線 | |
| <table></table> | 表格 | |
| <th></th> | 標題欄位 | |
| <tr></tr> | 列 | |
| <td></td> | 欄 | |
| <caption></caption> | 表格標題 | |
| <colgroup></colgroup> | 欄群組 | |
| <col> | 欄群組屬性設定 | |
| <thead></thead> | 表格標題群組 | |
| <tbody></tbody> | 表格內容群組 | |
| <tfoot></tfoot> | 表格頁尾群組 | |
| <ul></ul> | 定義無順序清單 | |
| <ol></ol> | 定義有順序清單 | |
| <li></li> | 清單項目 | |
| <dl></dl> | 定義描述清單 | |
| <dt></dt> | 描述項目 | |
| <dd></dd> | 項目說明 | |
| <div></div> | 定義區塊型的區域 | |
| <span></span> | 定義單行型的區域 | |
| <header></header> | 定義網頁標題區域 | HTML 5新增 |
| <nav></nav> | 定義網頁導覽區域 | HTML 5新增 |
| <main></main> | 定義網頁主內容區塊 | HTML 5新增 |
| <section></section> | 定義網頁章節區域 | HTML 5新增 |
| <article></article> | 定義網頁內容區域 | HTML 5新增 |
| <aside></aside> | 定義網頁邊欄區域 | HTML 5新增 |
| <footer></footer> | 定義網頁頁尾區域 | HTML 5新增 |
| <details></details> | 定義詳細訊息 | HTML 5新增 |
| <summary></summary> | 定義詳細訊息總結 | HTML 5新增 |
| <iframe></iframe> | 內嵌頁框 | |
| <menuitem></menuitem> | 彈出式選單內容 | HTML 5新增（僅Firefox支援） |
| 標籤 | 說明 | 備註 |
|---|---|---|
| <b></b> | 粗體字 | |
| <strong></strong> | 粗體字 | 除了文字樣式上變粗之外，語意上也有加強的意思 |
| <i></i> | 斜體字 | |
| <em></em> | 斜體字 | 除了文字樣式上變斜之外，語意上也有強調的意思 |
| <small></small> | 較小的字 | |
| <mark></mark> | 突顯的字 | HTML 5新增 |
| <del></del> | 刪除的字 | |
| <ins></ins> | 加入的字 | |
| <sub></sub> | 下標字 | |
| <sup></sup> | 上標字 | |
| <q></q> | 引用 | 用於較短的文字引用 |
| <blockquote></blockquote> | 引用 | 用於較長的文字引用，利用cite屬性說明出處 |
| <abbr></abbr> | 縮寫字說明 | 利用title屬性說明縮寫字 |
| <address></address> | 聯絡資訊 | |
| <cite></cite> | 作品標題 | |
| <bdo></bdo> | 文字方向 | 利用dir屬性決定方向（ltr：由左向右、rtl：由右向左） |
| <dfn></dfn> | 術語 | |
| <kbd></kbd> | 鍵盤輸入 | 表達需要使用者用鍵盤按下某按鍵 |
| <samp></samp> | 電腦回饋內容 | |
| <code></code> | 程式碼 | |
| <pre></pre> | 預先格式化 | 內容會按照在HTML中的排版來顯示 |
| <var></var> | 變數 | |
| <ruby></ruby> | 文字音標 | HTML 5新增 |
| <rt></rt> | 文字音標內容 | HTML 5新增 |
| <rp></rp> | 不支援文字音標時顯示 | HTML 5新增 |
| <time></time> | 定義日期時間 | HTML 5新增 |
| <bdo></bdo> | 反向文字 | HTML 5新增 |
| <bdo></bdo> | 對話框 | HTML 5新增 |
| <figure></figure> | 圖片說明 | HTML 5新增 |
| <figcaption></figcaption> | 圖片說明內容 | HTML 5新增 |
| 標籤 | 說明 | 備註 |
|---|---|---|
| <a></a> | 超連結 |
| 標籤 | 說明 | 備註 |
|---|---|---|
| <img> | 圖片 | |
| <map></map> | 影像連結地圖 | |
| <area></area> | 影像連結區域 | |
| <svg></svg> | 網頁向量圖檔 | HTML 5新增 |
| 標籤 | 說明 | 備註 |
|---|---|---|
| <form></form> | 表單範圍 | |
| <input> | 表單輸入項目 | |
| <fieldset></fieldset> | 表單欄位群組 | |
| <legend></legend> | 表單欄位群組名稱 | |
| <select></select> | 表單選單 | |
| <optgroup></optgroup> | 表單選單選項群組 | |
| <option></option> | 表單選單選項 | |
| <textarea></textarea> | 表單文字區域 | |
| <button></button> | 表單按鈕 | |
| <datalist></datalist> | 表單資料清單 | |
| <keygen> | 表單金鑰產生欄位 | HTML 5新增 |
| <output></output> | 表單計算結果欄位 | |
| <meter></meter> | 量度圖形 | HTML 5新增 |
| <progress></progress> | 進度圖形 | HTML 5新增 |
| 標籤 | 說明 | 備註 |
|---|---|---|
| <canvas></canvas> | 畫布區域 | HTML 5新增 |
| <audio></audio> | 聲音內容 | HTML 5新增 |
| <video></video> | 視訊內容 | HTML 5新增 |
| <source> | 內容來源 | HTML 5新增 |
| <track> | 內容字幕指定 | HTML 5新增 |
| <embed> | 外部程式內容嵌入 | HTML 5新增 |
| <object></object> | 外部程式內容嵌入 | HTML 5新增 |
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