PART I: THE LANGUAGE OF THE WEB in .NET framework

Drawer Quick Response Code in .NET framework PART I: THE LANGUAGE OF THE WEB
CHAPTER
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PART I: THE LANGUAGE OF THE WEB
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PARSING CODE
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Sooner or later, you ll hear the phrase parsing code in reference to browsers and HTML5, CSS3, and JavaScript. All that means is that the browser is reading the code and interpreting it to do what it s told to do. It s just like an international interpreter who speaks English and Russian the interpreter parses Russian so that the English speaker understands it and English so that Russian speaker understands it. Strictly speaking, the parser is part of the interpreter in the browser, but for all practical purposes, just think of parsing as involved in getting the Web page to do what you told it to do in the tags you used in your Web file. In order to correctly parse HTML5, two things have to happen: You have to write the code correctly, and your browser has to interpret it correctly. That s why standards are important. Basically, standards insure that when you write HTML5 code according to the rules set down, your code does what you expect it to do in all browsers and on all computers. Using HTML5, CSS3, and JavaScript with the browsers discussed in 1, you shouldn t have any surprises when they re all fully HTML5 compliant. Ironically, the standards allow for the most designer and developer creativity. If you want to have the page look or act in a certain way, following the standards used by the browsers that interpret your creations, they ll look the way you want them to look and behave as expected. If either you or the browser fails to follow the standards, your creativity is ruined. (We don t want that now, do we ) 28
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UNDERSTANDING HTML5 AND RELATED FILES
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As you saw in 1, to create an HTML5 file, all you have to do is save the code using a text editor like Notepad (Windows) or TextEdit (Mac) and use the extension .html at the end of the file name. (MyCoolPage.html is an example.) The .html extension is important because it is recognized as a Web page and not something else that your browser can t parse. You ll also find that only certain kinds of other files are recognized by the browser s interpreter and need certain extensions. Here are the most common file types you ll encounter:
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.jpg (JPEG graphic file) .gif (GIF graphic file) .png (PNG graphic file) .svg (SVG graphic file) .css (Cascading Style Sheet) .js (JavaScript file)
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The most important of these are the graphic files because the tools you use for your graphics may automatically save them with different filenames than those that can be used for the Web. For example, Adobe Photoshop automatically saves files as .psd files, and Adobe Illustrator saves its files in .ai format. Neither graphic file format can be used with Web pages. However, most graphic creation tools will save the files as .jpg, .gif, or .png if you use Save As instead of just plain Save. When you use Save As, you can select from an available list of file types on most tools, including text editors, word processors, and graphic drawing tools.
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CHAPTER 2: UNDERSTANDING HTML5 TAGS
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Fixing Windows default le extension settings
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The default settings for Windows 7 (and earlier versions) is to hide le extensions. That will give your les a cleaner appearance, but if you have to decide between selecting a graphic le with a .psd extension or a .png extension, you need to see what the extension is. Here s what to do:
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1. Open the Control Panel. 2. Choose Appearance and Personalization Folder Options Show Hidden Files and
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Folders.
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3. Uncheck Hide Extensions for Known File Types (see the gure).
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Uncheck this box
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Unchecking the Hide Extensions for Known File Types check box in Windows.
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Now you ll be able to see all your le extensions. So, when you want to load a graphic le, you ll know whether it s a .png, .jpg, or .gif le just by looking at the lename displayed on your computer screen.
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