Lets take a moment and talk about some of its features. Gears is composed of several modules that add functionality more typical of desktop applications to the browser. Before the advent of HTML5, many applications used Gears in some way, including Google properties (Gmail, YouTube, Doc, Reader, and so on), MySpace, Remember the Milk, and WordPress, among others. Google Gears, which was initially released in May 2007, has come to define some of the advanced features of the HTML5 draft specification. As a means to not let the lack of features limit innovation, Google created Chrome Frame and Google Gears (later, simply Gears) to bring advanced features to older browsers. Bridging the DivideĮven the best of standards takes a while to gain uptake. JavaScript as a primary programming language has found its way into server-side web components, such as Node.js, and mobile application frameworks, such as WebOS and PhoneGap. We are currently in the midst of another JavaScript renaissance, as the major browser makers have been using the speed of their JavaScript engines as a benchmark for comparison. Gmail, Twitter, and Facebook are examples of these types of applications. As opposed to creating a set of static pages, a developer was empowered to create highly dynamic applications. XMLHttpRequest allows a website to connect to a remote server and receive structured data. Once regarded as a toy for amateurs and script kiddies, AJAX helped developers solve more complex problems.Īt the epicenter of AJAX is the XMLHttpRequest object invented by Microsoft in the late 1990s. It become widely used for scripting client-side web pages, and Microsoft released a compatible version named JScript, with some additions and changes, because Sun held the trademark on the nameĪJAX (Asynchronous JavaScript and XML) started a new wave of interest in JavaScript programming. The language was renamed JavaScript as part of a marketing agreement between Sun Microsystems (now Oracle Corporation) and Netscape to promote the scripting language alongside Sun’s Java applet technology.
Despite the name, JavaScript is most similar to the C programming language, although it does inherit some aspects from Java.
It is a loosely typed scripting language that is prototype-based and can be object-oriented or functional. JavaScript (née LiveScript and formally known as ECMAScript) started as a scripting language for the browser from Netscape Communications. Those additions transformed the Web from a medium that presented static unidirectional data, like a newspaper or book, to a bidirectional medium allowing communication in both directions. HTML (Hypertext Markup Language), invented by Tim Berners-Lee, has come a long way since its inception in 1990.įigure 1-1 shows an abbreviated timeline of HTML from the HTML5Rocks slides ( ).Īlthough all the advancements were critical in pushing standards forward, of particular interest to our pursuits is the introduction of JavaScript in 1996 and AJAX in 2005. In this chapter, we discuss the features added by HTML5 and the associated JavaScript APIs. There are many notable additions to HTML, such as native drawing support and audiovisual elements. It has rules for parsing to allow different browsers to display the same incorrectly formatted document in the same fashion. HTML5 also has more allowances for incorrect syntax than were present in HTML4.
Some elements have been removed and it is no longer based on SGML, an older standard for document markup. It represents a break from its predecessors, HTML4 and XHTML. HTML5 is a draft specification for the next major iteration of HTML.
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