1. XHTML

2. What Is XHTML? XHTML stands for EXtensible HyperText Markup Language XHTML is almost identical to HTML XHTML is stricter than HTML XHTML is HTML defined as an XML application XHTML is supported by all major browsers

3. Why XHTML? This HTML code works fine in most browsers (even if it does not follow the HTML rules): This is bad HTML Bad HTML This is a paragraph

4. XML is a markup language where documents must be marked up correctly (be "well- formed"). By combining the strengths of HTML and XML, XHTML was developed. XHTML is HTML redesigned as XML.

5. The Most Important Differences from HTML: Document Structure XHTML DOCTYPE is mandatory The xmlns attribute in is mandatory,,, and are mandatory

6. XHTML Elements XHTML elements must be properly nested – In HTML, some elements can be improperly nested within each other, like this: – This text is bold and italic – In XHTML, all elements must be properly nested within each other, like this: – This text is bold and italic XHTML elements must always be closed This is wrong: – This is a paragraph This is another paragraph This is correct: – This is a paragraph This is another paragraph XHTML documents must have one root element

7. XHTML elements must be in lowercase – This is wrong: This is a paragraph – This is correct: This is a paragraph

8. XHTML Attributes Attribute names must be in lower case Attribute values must be quoted Attribute minimization is forbidden

9. XHTML Attribute Names Must Be In Lower Case – This is wrong: – This is correct: Attribute Values Must Be Quoted – This is wrong: – This is correct:

10. Attribute Minimization Is Forbidden – Wrong: – Correct: – Wrong: – Correct:

11. How to Convert from HTML to XHTML Add an XHTML to the first line of every page Add an xmlns attribute to the html element of every page Change all element names to lowercase Close all empty elements Change all attribute names to lowercase Quote all attribute values

12. An XHTML document must have an XHTML DOCTYPE declaration. A complete list of all the XHTML Doctypes is found in our HTML Tags Reference.XHTML Doctypes The,,, and elements must also be present, and the xmlns attribute in must specify the xml namespace for the document. This example shows an XHTML document with a minimum of required tags:

13. Title of document some content

16. HTML 5.0

17. The DOCTYPE declaration for HTML5 is very simple: – The character encoding (charset) declaration is also very simple: – HTML5 Example: Title of the document Content of the document......

18. The most interesting new elements are: New semantic elements like,,, and. New form control attributes like number, date, time, calendar, and range. New graphic elements: and. New multimedia elements: and.

19. The HTML element is used to draw graphics, on the fly, via scripting (usually JavaScript). The element is only a container for graphics. You must use a script to actually draw the graphics. Canvas has several methods for drawing paths, boxes, circles, text, and adding images.

21. What is SVG? SVG stands for Scalable Vector Graphics SVG is used to define graphics for the Web SVG is a W3C recommendation SVG has several methods for drawing paths, boxes, circles, text, and graphic images.

24. Differences Between SVG and Canvas SVG is a language for describing 2D graphics in XML. Canvas draws 2D graphics, on the fly (with a JavaScript). SVG is XML based, which means that every element is available within the SVG DOM. You can attach JavaScript event handlers for an element. In SVG, each drawn shape is remembered as an object. If attributes of an SVG object are changed, the browser can automatically re-render the shape. Canvas is rendered pixel by pixel. In canvas, once the graphic is drawn, it is forgotten by the browser. If its position should be changed, the entire scene needs to be redrawn, including any objects that might have been covered by the graphic.

35. The most interesting new API's are: HTML Geolocation HTML Drag and Drop HTML Local Storage HTML Application Cache HTML Web Workers HTML SSE

36. The HTML Geolocation API is used to get the geographical position of a user. Use the getCurrentPosition() method to get the user's position. Geolocation is much more accurate for devices with GPS, like iPhone. Drag and drop is a very common feature. It is when you "grab" an object and drag it to a different location. In HTML5, drag and drop is part of the standard, and any element can be draggable.

37. To make an element draggable, set the draggable attribute to true: What to Drag - ondragstart and setData() – Then, specify what should happen when the element is dragged. The ondragover event specifies where the dragged data can be dropped. Do the Drop - ondrop When the dragged data is dropped, a drop event occurs.

38. What is HTML Local Storage? With local storage, web applications can store data locally within the user's browser. Before HTML5, application data had to be stored in cookies, included in every server request. Local storage is more secure, and large amounts of data can be stored locally, without affecting website performance. Unlike cookies, the storage limit is far larger (at least 5MB) and information is never transferred to the server. Local storage is per domain. All pages, from one domain, can store and access the same data. HTML Local Storage Objects HTML local storage provides two objects for storing data on the client: window.localStorage - stores data with no expiration date window.sessionStorage - stores data for one session (data is lost when the browser tab is closed)

39. What is Application Cache? HTML5 introduces application cache, which means that a web application is cached, and accessible without an internet connection. Application cache gives an application three advantages: Offline browsing - users can use the application when they're offline Speed - cached resources load faster Reduced server load - the browser will only download updated/changed resources from the server

40. A web worker is a JavaScript running in the background, without affecting the performance of the page. Server-Sent Events allow a web page to get updates from a server.

41. HTML Block and Inline Elements Block-level Elements A block-level element always starts on a new line and takes up the full width available (stretches out to the left and right as far as it can). The element is a block-level element. Examples of block-level elements: -

42. Inline Elements An inline element does not start on a new line and only takes up as much width as necessary. This is an inline element inside a paragraph. Examples of inline elements: