Tham khảo tài liệu 'tự học html và css trong 1 giờ - part 61', công nghệ thông tin, đồ họa - thiết kế - flash phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 576 LESSON 19 Designing for the Real World HTML5 also drops a number of tags that were deprecated in previous HTML specifications. I ve noted which tags have been dropped throughout the book. It s unknown whether browsers will ignore those tags if a page uses the HTML5 DOCTYPE but they are no longer part of HTML5. One important new feature of HTML5 which I discussed in Lesson 12 Integrating Multimedia Sound Video and More is native video playback without plug-ins. The video tag can be used to embed movies in web pages without the Flash player or any other video player. Likewise HTML5 also enables you to create images using markup via the canvas element. The canvas tag is used to define the size and location of the generated image and the actual image is defined using JavaScript. The canvas element will allow web programmers to do things such as create graphs on-the-fly without using external images. Browsers like Safari Google Chrome and Firefox already support the canvas element. In addition to new tags HTML5 provides some new interfaces for JavaScript programmers. For programmers HTML5 enables web applications to behave a lot more like desktop applications incorporating features that have been implemented outside the browser by Flash and other plug-ins and making some features that developers implement in JavaScript more powerful. HTML5 supports local storage for web applications enabling websites to actually store data on the user s computer. This enables applications to manage their own data cache on each computer. They can store images or other web content locally so that it doesn t have to be downloaded each time the user visits the site or store application the user enters on their own computer. For example using local storage you could create a browser-based email client that allows users to draft outgoing emails when the computer is offline and then send them all when the user visits the application after reconnecting to the Internet. HTML5 includes .
