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Html5 Architecture Pdf

Dale Cruse is the author of HTML5 Mulfimedia Development Cookbook (Packt Publishing) and a technical Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? architecture such as. our design has influenced the security architecture of up- coming Chrome applications. In our architecture, HTML5 applications can de- fine more expressive. PDF | Web Services based architectures have already been established as the preferred way to integrate SOA specific components, from the front-end to the.

Now it's time to share a new technical article—revealing the specifics of using Node. In web development, such terms as ''web app'', ''front-end architecture'', ''Web 2. Today we'll find out more about the web application architecture types in the light of the latest web trends and key issues that matter to software product owners. We can outline 3 main web application architecture types and discuss their advantages and drawbacks. We can evaluate them according to three points of view: software owner, software developer member of the dedicated team allocated to the project and end user. Other possible examples basically come down to these three as subtypes. First let's define a web application: it's a client-server application, where there's a browser the client and a web server. The logic of a web application is distributed among the server and the client, there's a channel for information exchange, and the data is stored mainly on the server. Further details depend on the architecture: different ones place and distribute the logic in different ways. It's hard to compare completely different architectures impartially.

The purpose of this tree is to enable painting the contents in their correct order. Firefox calls the elements in the render tree "frames". WebKit uses the term renderer or render object. A renderer knows how to lay out and paint itself and its children. It includes geometric information like width, height and position. The box type is affected by the "display" value of the style attribute that is relevant to the node see the style computation section.

In WebKit if an element wants to create a special renderer, it will override the createRenderer method. The renderers point to style objects that contains non geometric information. Non-visual DOM elements will not be inserted in the render tree.

An example is the "head" element. Also elements whose display value was assigned to "none" will not appear in the tree whereas elements with "hidden" visibility will appear in the tree. There are DOM elements which correspond to several visual objects. These are usually elements with complex structure that cannot be described by a single rectangle. For example, the "select" element has three renderers: one for the display area, one for the drop down list box and one for the button.

Also when text is broken into multiple lines because the width is not sufficient for one line, the new lines will be added as extra renderers. Another example of multiple renderers is broken HTML. According to the CSS spec an inline element must contain either only block elements or only inline elements. In the case of mixed content, anonymous block renderers will be created to wrap the inline elements. Some render objects correspond to a DOM node but not in the same place in the tree.

Floats and absolutely positioned elements are out of flow, placed in a different part of the tree, and mapped to the real frame. A placeholder frame is where they should have been. Figure : The render tree and the corresponding DOM tree 3. The "Viewport" is the initial containing block. The presentation delegates frame creation to the FrameConstructor and the constructor resolves style see style computation and creates a frame.

In WebKit the process of resolving the style and creating a renderer is called "attachment". Every DOM node has an "attach" method. Attachment is synchronous, node insertion to the DOM tree calls the new node "attach" method.

Processing the html and body tags results in the construction of the render tree root. The root render object corresponds to what the CSS spec calls the containing block: the top most block that contains all other blocks. Its dimensions are the viewport: the browser window display area dimensions.

This is the render object that the document points to. The rest of the tree is constructed as a DOM nodes insertion. See the CSS2 spec on the processing model. Style Computation Building the render tree requires calculating the visual properties of each render object. This is done by calculating the style properties of each element. The style includes style sheets of various origins, inline style elements and visual properties in the HTML like the "bgcolor" property.

The later is translated to matching CSS style properties.

The origins of style sheets are the browser's default style sheets, the style sheets provided by the page author and user style sheets—these are style sheets provided by the browser user browsers let you define your favorite styles. In Firefox, for instance, this is done by placing a style sheet in the "Firefox Profile" folder. Style computation brings up a few difficulties: Style data is a very large construct, holding the numerous style properties, this can cause memory problems.

Finding the matching rules for each element can cause performance issues if it's not optimized.

Architecture of HTML5 forms

Traversing the entire rule list for each element to find matches is a heavy task. Selectors can have complex structure that can cause the matching process to start on a seemingly promising path that is proven to be futile and another path has to be tried.

You choose a certain path up the tree for checking. You may need to traverse the node tree up just to find out there are only two divs and the rule does not apply. You then need to try other paths in the tree.

Applying the rules involves quite complex cascade rules that define the hierarchy of the rules.

Let's see how the browsers face these issues: Sharing style data WebKit nodes references style objects RenderStyle. These objects can be shared by nodes in some conditions. The nodes are siblings or cousins and: The elements must be in the same mouse state e.

WebCore simply throws a global switch when any sibling selector is encountered and disables style sharing for the entire document when they are present. Firefox rule tree Firefox has two extra trees for easier style computation: the rule tree and style context tree.

WebKit also has style objects but they are not stored in a tree like the style context tree, only the DOM node points to its relevant style. Figure : Firefox style context tree 2. The values are computed by applying all the matching rules in the correct order and performing manipulations that transform them from logical to concrete values. For example, if the logical value is a percentage of the screen it will be calculated and transformed to absolute units. The rule tree idea is really clever.

It enables sharing these values between nodes to avoid computing them again. This also saves space. All the matched rules are stored in a tree.

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The bottom nodes in a path have higher priority. The tree contains all the paths for rule matches that were found. Storing the rules is done lazily.

The tree isn't calculated at the beginning for every node, but whenever a node style needs to be computed the computed paths are added to the tree. The idea is to see the tree paths as words in a lexicon. Lets say we already computed this rule tree: Suppose we need to match rules for another element in the content tree, and find out the matched rules in the correct order are B-E-I.

We will now have less work to do. Let's see how the tree saves us work. Division into structs The style contexts are divided into structs. Those structs contain style information for a certain category like border or color.

All the properties in a struct are either inherited or non inherited. Inherited properties are properties that unless defined by the element, are inherited from its parent. Non inherited properties called "reset" properties use default values if not defined. The tree helps us by caching entire structs containing the computed end values in the tree.

The idea is that if the bottom node didn't supply a definition for a struct, a cached struct in an upper node can be used. Computing the style contexts using the rule tree When computing the style context for a certain element, we first compute a path in the rule tree or use an existing one.

Portfolio Section. Now, let's move onto the next bit and make a portfolio section that will contain a gallery. The structure of our HTML code for Thanks to those who joined and coded along during our recent webcast, in which timanglade demonstrated how to build a mobile app from Type "Portfolio Cover" under Name, set the Width to Cube Visualization Ecosystem Architecture.

Our Architecture BA Honours degree is your first step towards Download course PDF Click here to visit our frequently asked questions about HTML All candidates must submit a portfolio as part of the application Structuring content with fields Kirby ; Jan 11, Use Kirby's power of custom fields to structure your content in a most flexible way.

Kirby is perfect to build portfolio sites for designers, architects, Probably just an additional portrait of the speaker and maybe a pdf with Although many companies still allow you to upload a PDF version of your portfolio in the As the main security criterion we'll consider the possibility of changes in functionality of app behavior on the client side, and all associated risks.

Standard dangers are the same for the compared architectures. We do not consider security on the server-client channel, because all these architectures are equally exposed to break-ins. This channel can be the same.

Conversion: website — mobile or desktop application Conversion into a mobile or desktop application with minimal additional costs. Some of these criteria might seem inaccurate, but the purpose of the article is not to show what's good and what's bad. It's more of a detailed review that shows the possible options. Let's outline three main web-based application types according to the roles performed by the server and the client browser.

Sometimes this architecture is called ''Web 1. The least optimal value among these architecture examples. A huge amount of data is transferred between the server and the client. The user has to wait until the whole page reloads, responding to trivial actions, for example, when only a part of the page needs to be reloaded. UI templates on the client depend directly on the frameworks applied on the server.

Due to the limitations of mobile internet and huge amounts of transferred data, this architecture is hardly applicable in the mobile segment. There are no means of sending instant data updates or changes in real time. If we consider the possibility of real-time updates via generation of ready chunks of content on the server side and updates of the client through AJAX, WebSockets , plus design with partial changes within a page, we'll go beyond this architecture.

The highest of the three, since it's the easiest implementable. Rather easily implemented, similarly to the previous criterion. The content is known beforehand. This is the oldest architecture in web development, so it's possible to choose any server language and framework for particular needs.

If we take a look at the generation of HTML, under the increasing load comes the moment when load balance will be needed. There's a much more complicated situation with scaling databases, but this task is the same for these three examples of software architecture.

Tightly bound to responsiveness and scalability. Performance is relatively low because a big amount of data must be transferred, containing HTML, design, and business data.

Therefore it's necessary to generate data for the whole page not only for the changed business data , and all the accompanying information such as design.

The good thing is that there's no need for special tools, which support JavaScript interpretation, to test the front-end, and the content is static. The application behavior logic is on the server side. However, data are transferred overtly, so a protected channel may be needed which is basically a story of any architecture that concerns the server. All the security functionality is on the server side. In most cases it's simply impossible. Rarely there's an exception more of exotics : for example, if the server is realized upon node.

Html5 Architecture Book | Free PDF Books

Thus one can wrap the application in node-webkit or analogous means. Implemented with a manifest on the server, which is entered to HTML5 specifications. If the browser supports such a specification, all pages of the application will be cached: in case the connection is off, the user will see a cached page.

The difference is that the page, which is displayed in the browser, consists of widgets functionally independent units. By lowering interactivity we boost the development speed and make functionality cheaper and more reliable. The foremost advantage is that updates from the server arrive only for the part of the page requested by the client. It's also good that widgets are separated functionally. A particular widget is in charge of a part of the page; partial changes will not affect the whole page.

The volume of transferred data for a part of a page is smaller than for the whole page, that's why responsiveness is higher. But since a page is a set of widgets, the applicable UI templates in a web application are limited by the chosen UI framework.

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