HTML is HyperText Markup Language used to develop the website.
XHTML is modern version of HTML 4. XHTML is an HTML that follows the XML rules which should be well-formed.
Clone function is useful in creating a complete new object in Coffee Script by
☛ Copying all attributes from the source object to the new object
☛ Repeating the steps of copying attributes from the source object for all sub-objects by calling the clone-function
☛ Creating a new object as the source object
☛ Sprites, compressed images, smaller images;
The basic rule for Coffee Script:
☛ Whitespace matters: There are no curly braces in CoffeeScript
☛ No parentheses: Functions that take arguments do not require parentheses
The goals of such standards are to ensure cross-platform compatibility and more compact file sizes. The focus of these standards has been to separate "content" from "formatting" by implementing CSS. It eases maintenance and development.
Closures are expressions, usually functions, which can work with variables set within a certain context. Or, to try and make it easier, inner functions referring to local variables of its outer function create closures.
Flask uses thread local objects internally so that user don't have to pass objects around from function to function within a request in order to stay threadsafe. This approach is useful, but it requires a valid request context for dependency injection or when attempting to reuse code which uses a value pegged to the request.
Ie6 is not dead, just ask China which represents a nice chunk of the worlds online population. Your pages should at least be functional on IE6, unless you dont care about half the worlds population.