By Robin Nixon

Master Hypertext Preprocessor in 20 lessons--online video tutorials included!

Based at the author's winning on-line classes, this whole, built-in studying instrument presents easy-to-follow classes that characteristic transparent causes, pattern code and workouts, and video tutorials.

Each lesson is designed to take you under an hour to complete.

PHP: 20 classes to profitable net Development covers the fundamentals, together with constants, superglobals, operators, and arrays. subsequent, you'l examine ow to paintings with multidimensional arrays, write unctions, manage gadgets, construct net varieties, anage defense, use Ajax, and masses extra. ogether, the publication and nearly 5 hours of video education make studying Hypertext Preprocessor more uncomplicated than ever!

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Extra info for CSS & CSS3. 20 Lessons to Successful Web Development

Example text

This is a less popular unit of measurement that is most often used as a good approximation for helping to set the width of a box that will contain some text. Some designers think of the ex as being the height equivalent of using em units for width. classname { width:20ex; } Unless you have a clear reason for doing so, I recommend you generally avoid using this measurement because, when users enlarge or reduce the browser window contents (for example, by scrolling the mouse wheel while holding down the ALT key), any measurements set in values of ex will change at a greater rate—enlarged ex text gets much larger than the rest, while reduced ex text gets much smaller.

8. classname? 9. What is the universal selector? 10. How can you select groups of elements at a time? com/ nixoncss/. O ne of the most fundamental things about CSS properties is that they cascade, which is why they are called Cascading Style Sheets. But what does this mean? Cascading is a method used to resolve potential conflicts between the various types of style sheet a browser supports, and apply them in order of precedence by who created them, the method used to create the style, and types of properties selected.

If you place the photo in a

and give that

a unique ID, you can easily style a frame for the photo that can be changed at any time without going back and modifying the main document contents. What’s more, if your boss then asks you to turn the photo into a slideshow, you can probably write some JavaScript to access the ID and create such an effect without having to make any changes to the news item. jpg'>

Fishing boat at the beach

And CSS rules to style the frame around the photo (and the caption) might look like this (see Figure 3-1): #mainphoto { width :320px; background:#eee; padding :20px 20px 2px 20px; border :1px solid #888; } #caption { font-style:italic; text-align:center; } Lesson 3 FIGURE 3-1 Applying Declarations to IDs and Classes 21 Styling a photograph and caption These rules could be placed either in a