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<meta http-equiv= Refresh content= .5; URL=pg2.html >
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Notice how the content value of both the number of seconds and the URL are in the same set of quotation marks. The following HTML5 code launches a series of pages that keep refreshing until a home page is loaded:
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<!DOCTYPE HTML> <html>
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<head> <meta http-equiv= Content-Type content= text/html; charset=UTF-8 > <meta http-equiv= Refresh content= .5; URL=pg2.html > <title>Image 1</title> </head> <body> <img src= one.png alt= one > </body> </html>
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After the initial page, you would have the following sequence only one per page: Page 2: <meta Page 3: <meta Page 4: <meta Page 5: <meta
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html > http-equiv= Refresh content= .5; URL=pg3.html > http-equiv= Refresh content= .5; URL=pg4.html > http-equiv= Refresh content= .5; URL=pg5.html > http-equiv= Refresh content= .5; URL=homeNow.
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The home page, homeNow.html, would have no Refresh state in the <meta> tag. In fact, other than the meta element with the Content-Type, it would have no other meta tag. (This thing would go on forever if you looped the home page back to the first page!)
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CHAPTER 5: ORGANIZING A PAGE KNOWING WHEN YOU NEED A SCRIPT
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The more you use HTML5, the more you need a script to get the most out of your Web pages. The most common scripting language used with HTML5 is JavaScript. Your browser has an interpreter for JavaScript just as it does for HTML5. Fortunately, JavaScript is easy to learn and can work in small snippets even non-developers can do it. To include JavaScript, all you need to do is to add a little script to the head of your page. Here s the tag format:
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<script type= text/javascript >
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The JavaScript program goes into the remainder of the <script> container. The following HTML5 code (ScriptTag.html in this chapter s folder at www.wiley.com/go/ smashinghtml5) shows how easy JavaScript is to learn.
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<!DOCTYPE HTML> <html> <head> <script type= text/javascript > alert( I can do JavaScript! ); </script> <meta http-equiv= Content-Type content= text/html; charset=UTF-8 > <title>A Taste of JavaScript</title> </head> <body> A regular Web page.... </body> </html>
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When you test that little program, you ll see an alert box pop up (shown in Figure 5-2).
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Figure 5-2: A JavaScript alert window.
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As a side note, you ll see that the JavaScript alert window is loaded before your Web page loads. That s because everything in the head container loads first. If you have a more elaborate JavaScript program that will be used in your HTML5 page, you ll want to test it on different browsers and also put it in an external JavaScript file. Figure 5-3 shows the same alert window in Safari on an iPhone; you can clearly see that the Web page associated with the HTML5 code has not loaded.
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PART II: PAGES, SITES, AND DESIGNS
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As soon as the user clicks OK, the Web page loads. In the meantime, you can see the files from the directory in the background on your mobile device. Additionally, notice that the alert window shows the domain where the JavaScript resides. Some browsers, such as Google s Chrome, first check to see if the user wants to accept the JavaScript from the named site before it shows the actual alert (a double alert!).
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Figure 5-3: Alert window loading before Web page.
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As with style sheets, JavaScript programs can be loaded from external files. However, instead of using the link element, the JavaScript files are loaded using the script element, as the following example shows:
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<script type= text/javascript src= smashingJS.js ></script>
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The JavaScript file is saved using the .js extension, just as CSS3 files are saved using the .css extension. You ll see JavaScript is employed a good deal when using the <canvas> tag and several other HTML5 tags in Part IV of this book. Further, <script> tags and the JavaScript code in them can be added right in the middle of an HTML5 script. The advantage of placing your JavaScript in the head container, though, is that it s loaded first, before the Web page.