什麼是 World Wide Web (WWW)?
World Wide Web(www)是一個網路上的訊息資源,他主要依賴以下三種機制:
一個統一的命名方案,用在網路上定位資源所在。(例如 : URIs)
2.)Protocols, for access to named resources over the Web (e.g., HTTP).
協定,網路上用來存取資源的一種溝通方法。(例如:HTTP)
3.)Hypertext, for easy navigation among resources (e.g., HTML).
超本文,用來對各類資源輕易的導覽。
URI(Universal Resource Identifier)簡介
Every resource available on the Web -- HTML document, image, video clip, program, etc. -- has an address that may be encoded by a Universal Resource Identifier, or "URI".
網頁HTML-Document中每個可用資源,image, video clip, program, etc,
有一個位址他也許是經過編碼的Universal Resource Identifier或稱URI。
URI是由下列三個項目構成:
- The naming scheme of the mechanism used to access the resource.
- The name of the machine hosting the resource.
- The name of the resource itself, given as a path.
http://www.w3.org/TR
http是通訊協定,www.w3.org是Server所在的網路位置,/TR 是機器(Server)上的資料路徑。
<A href="mailto:jt@gmail.com">JT</A>
片段識別 (Fragment identifiers)
http://somesite.com/html/top.html#section_2
#section_2就是一個片段識別。
What is HTML?
- HTML stands for Hyper Text Markup Language
- HTML is not a programming language, it is a markup language
- A markup language is a set of markup tags
- HTML uses markup tags to describe web pages
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