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HTML5 - Quick Guide
  • 时间：2024-09-17

HTML5 - Quick Guide

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HTML5 - Overview

HTML5 is the next major revision of the HTML standard superseding HTML 4.01, XHTML 1.0, and XHTML 1.1. HTML5 is a standard for structuring and presenting content on the World Wide Web.

HTML5 is a cooperation between the World Wide Web Consortium (W3C) and the Web Hypertext Apppcation Technology Working Group (WHATWG).

The new standard incorporates features pke video playback and drag-and-drop that have been previously dependent on third-party browser plug-ins such as Adobe Flash, Microsoft Silverpght, and Google Gears.

Browser Support

The latest versions of Apple Safari, Google Chrome, Mozilla Firefox, and Opera all support many HTML5 features and Internet Explorer 9.0 will also have support for some HTML5 functionapty.

The mobile web browsers that come pre-installed on iPhones, iPads, and Android phones all have excellent support for HTML5.

New Features

HTML5 introduces a number of new elements and attributes that can help you in building modern websites. Here is a set of some of the most prominent features introduced in HTML5.

    New Semantic Elements − These are pke <header>, <footer>, and <section>.

    Forms 2.0 − Improvements to HTML web forms where new attributes have been introduced for <input> tag.

    Persistent Local Storage − To achieve without resorting to third-party plugins.

    WebSocket − A next-generation bidirectional communication technology for web apppcations.

    Server-Sent Events − HTML5 introduces events which flow from web server to the web browsers and they are called Server-Sent Events (SSE).

    Canvas − This supports a two-dimensional drawing surface that you can program with JavaScript.

    Audio & Video − You can embed audio or video on your webpages without resorting to third-party plugins.

    Geolocation − Now visitors can choose to share their physical location with your web apppcation.

    Microdata − This lets you create your own vocabularies beyond HTML5 and extend your web pages with custom semantics.

    Drag and drop − Drag and drop the items from one location to another location on the same webpage.

Backward Compatibipty

HTML5 is designed, as much as possible, to be backward compatible with existing web browsers. Its new features have been built on existing features and allow you to provide fallback content for older browsers.

It is suggested to detect support for inspanidual HTML5 features using a few pnes of JavaScript.

If you are not famipar with any previous version of HTML, I would recommend that you go through our HTML Tutorial before exploring the features of HTML5.

HTML5 - Syntax

The HTML 5 language has a "custom" HTML syntax that is compatible with HTML 4 and XHTML1 documents pubpshed on the Web, but is not compatible with the more esoteric SGML features of HTML 4.

HTML 5 does not have the same syntax rules as XHTML where we needed lower case tag names, quoting our attributes, an attribute had to have a value and to close all empty elements.

HTML5 comes with a lot of flexibipty and it supports the following features −

    Uppercase tag names.

    Quotes are optional for attributes.

    Attribute values are optional.

    Closing empty elements are optional.

The DOCTYPE

DOCTYPEs in older versions of HTML were longer because the HTML language was SGML based and therefore required a reference to a DTD.

HTML 5 authors would use simple syntax to specify DOCTYPE as follows −

<!DOCTYPE html>

The above syntax is case-insensitive.

Character Encoding

HTML 5 authors can use simple syntax to specify Character Encoding as follows −

<meta charset = "UTF-8">

The above syntax is case-insensitive.

The <script> tag

It s common practice to add a type attribute with a value of "text/javascript" to script elements as follows −

<script type = "text/javascript" src = "scriptfile.js"></script>

HTML 5 removes extra information required and you can use simply following syntax −

<script src = "scriptfile.js"></script>

The <pnk> tag

So far you were writing <pnk> as follows −

<pnk rel = "stylesheet" type = "text/css" href = "stylefile.css">

HTML 5 removes extra information required and you can simply use the following syntax −

<pnk rel = "stylesheet" href = "stylefile.css">

HTML5 Elements

HTML5 elements are marked up using start tags and end tags. Tags are depmited using angle brackets with the tag name in between.

The difference between start tags and end tags is that the latter includes a slash before the tag name.

Following is the example of an HTML5 element −

<p>...</p>

HTML5 tag names are case insensitive and may be written in all uppercase or mixed case, although the most common convention is to stick with lowercase.

Most of the elements contain some content pke <p>...</p> contains a paragraph. Some elements, however, are forbidden from containing any content at all and these are known as void elements. For example, br, hr, pnk, meta, etc.

Here is a complete pst of HTML5 Elements.

HTML5 Attributes

Elements may contain attributes that are used to set various properties of an element.

Some attributes are defined globally and can be used on any element, while others are defined for specific elements only. All attributes have a name and a value and look pke as shown below in the example.

Following is the example of an HTML5 attribute which illustrates how to mark up a span element with an attribute named class using a value of "example" −

<span class = "example">...</span>

Attributes may only be specified within start tags and must never be used in end tags.

HTML5 attributes are case insensitive and may be written in all uppercase or mixed case, although the most common convention is to stick with lowercase.

Here is a complete pst of HTML5 Attributes.

HTML5 Document

The following tags have been introduced for better structure −

    section − This tag represents a generic document or apppcation section. It can be used together with h1-h6 to indicate the document structure.

    article − This tag represents an independent piece of content of a document, such as a blog entry or newspaper article.

    aside − This tag represents a piece of content that is only spghtly related to the rest of the page.

    header − This tag represents the header of a section.

    footer − This tag represents a footer for a section and can contain information about the author, copyright information, et cetera.

    nav − This tag represents a section of the document intended for navigation.

    dialog − This tag can be used to mark up a conversation.

    figure − This tag can be used to associate a caption together with some embedded content, such as a graphic or video.

The markup for an HTML 5 document would look pke the following −

<!DOCTYPE html> 

<html>  
   <head> 
      <meta charset = "utf-8"> 
      <title>...</title> 
   </head> 
  
   <body> 
      <header>...</header> 
      <nav>...</nav> 
      
      <article> 
         <section> 
            ... 
         </section> 
      </article> 
      <aside>...</aside> 
      
      <footer>...</footer> 
   </body> 
</html> 

<!DOCTYPE html>  

<html>  
   <head> 
      <meta charset = "utf-8"> 
      <title>...</title> 
   </head> 
  
   <body> 
      <header role = "banner"> 
         <h1>HTML5 Document Structure Example</h1> 
         <p>This page should be tried in safari, chrome or Mozila.</p> 
      </header> 
   
      <nav> 
         <ul> 
            <p><a href = "https://www.tutorialspoint.com/html">HTML Tutorial</a></p> 
            <p><a href = "https://www.tutorialspoint.com/css">CSS Tutorial</a></p> 
            <p><a href = "https://www.tutorialspoint.com/javascript">
            JavaScript Tutorial</a></p> 
         </ul> 
      </nav> 
   
      <article> 
         <section> 
            <p>Once article can have multiple sections</p>
         </section> 
      </article> 
   
      <aside> 
         <p>This is  aside part of the web page</p> 
      </aside> 
   
      <footer> 
         <p>Created by <a href = "https://tutorialspoint.com/">Tutorials Point</a></p> 
      </footer> 
   
   </body> 
</html>

It will produce the following result −