By David Powers
Beginning CSS3 teaches you the way to sort websites utilizing Cascading kind Sheets (CSS)—the language of website design. ranging from first rules, you’ll research via a chain of functional routines easy methods to switch the default glance of HTML tags, including colour, backgrounds, and borders. The e-book demystifies middle innovations, corresponding to the CSS field version and selectors, supplying you with the boldness and data to create leading edge and versatile web page layouts. You’ll additionally create rounded corners, drop shadows, and gradients with out the necessity for photos, utilizing the newest CSS3 thoughts.
<h3>What you’ll learn</h3> * Teaches the right way to variety appealing and versatile websites
* Hands-on workouts exhibit tips on how to mix variety principles for various results
* accomplished assurance of CSS2.1 and solid components of CSS3
<h3>Who this ebook is for</h3>
Beginning CSS3 is geared toward net designers who are looking to grasp using Cascading kind Sheets to kind and lay out smooth websites. It teaches center strategies, akin to the CSS field version and selecting the main applicable selectors to use kinds successfully. This makes it a good selection for either whole rookies and net designers who are looking to enhance their realizing of CSS.
<h3>Table of Contents</h3><ol> * Introducing CSS - the Language of website design
* utilizing simple Selectors
* Specifying Sizes, shades, and documents
* Styling textual content
* Embedding internet Fonts
* figuring out format with the CSS field version
* Floating parts for structure
* including Backgrounds
* including Borders and Drop Shadows
* Styling Lists and Navigation Menus
* Positioning components accurately
* Cross-Browser format suggestions
* utilizing complex Selectors
* Styling Tables
* Generated content material
* making a Print type Sheet
* focusing on types at varied units with Media Queries
* utilizing CSS3 Multi-Column format
* developing Gradients with out pictures
* second variations and Transitions
* Animating components with CSS Keyframes
* What subsequent?
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Extra info for Beginning CSS3
However, this creates a problem: there is no way to distinguish between the value zero and no value at all. What if the value you want to show is actually zero? To deal with this issue, Swift makes a very clear distinction between “no value” and all other values. “No value” is referred to as nil and is a different type from all others. If you’re coming from Objective-C, you might remember that nil is actually defined as a void pointer to zero. This makes it techni‐ cally a number, which means, in Objective-C, you can do things like this: int i = (int)(nil)+2; // Equals 2 (because 0 + 2 = 2) This isn’t allowed in Swift, because nil and Int are different types.
Operator checks the type of a variable and returns an optional value of the specified type: Working with Strings | 43 var maybeString = thing as? —an optional string. // If the check didn't work, maybeString will be nil. Use the as! operator works in the same way as the as? operator, except that it returns a nonoptional value of the specified type. If the value can’t be converted to the desired type, your program crashes. The as! operator is for when you’re absolutely sure that the value you’re converting is the right type, and you don’t want to work with optionals.
The debug area The area is split into two sections: the left hand side shows the values of local vari‐ ables when the application is paused; the right hand side shows the ongoing log from the debugger, which includes any logging that comes from the debugged application. You can show or hide the debug area by clicking on the view selector, at the top right of the window (see Figure 1-17). Figure 1-17. The central button in the view selector, which hides and shows the debug area Developing a Simple Swift Application Through the bulk of this book, we’ll be developing a complex, full-fledged Swift application, spanning three of Apple’s platforms: OS X, iOS, and watchOS.