HTML是Web開發的重要一環，HTML的官網是我們了解HTML的最佳學習資源。下面是HTML官網的源碼：

The HTML5 Herald
HTML5 is Here
HTML5 is the latest version of the Hypertext Markup Language (HTML), the language of the Internet. It is designed to make it easier to describe and publish web-based content and applications for a variety of devices and platforms. HTML5 includes a range of new features and improvements over its predecessor, HTML4, such as support for new multimedia elements like video and audio, improved support for web-based forms, enhanced semantic markup, better accessibility features, and more.
A Brief History of HTML
The history of HTML dates back to the early days of the World Wide Web, when Tim Berners-Lee invented the first web browser and laid the foundation for the modern web. HTML was initially designed to be a simple markup language for describing static documents, but over time it has evolved to become a powerful tool for creating dynamic, interactive websites and applications.

這個源碼文件主要是一個HTML5頁面，包含了一些基本的HTML標簽。頭部用來引入樣式文件和設置頁面標題等信息。主要內容放在body標簽內，包括標題、導航、兩個章節和頁腳。

值得一提的是，本頁面也使用了HTML5中的一些新特性，比如section標簽、header標簽、footer標簽等等。這些新的標簽能夠更好地描述網頁的結構和語義，并提高閱讀體驗和搜索引擎優化效果。