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CHAPTER 5 I BUILDING THE ULTIMATE AJAX DEVELOPER S TOOLBOX
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possible to the poorly written HTML page. Most browsers work by having two rendering modes, based on the doctype of the HTML page (if it s available): strict and quirks. Web browsers use a strict mode when the doctype indicates that a Web page is written to follow a certain W3C recommendation, such as HTML 4.1 or XHTML 1.0. Web browsers use a quirks mode when a doctype is not available or when the page has a number of conflicts with the specified doctype. As a developer, you should strive to create pages that adhere to a certain W3C standard. Doing so not only makes your Web pages accessible to all modern Web browsers but also makes your own life easier by ensuring that the browser can create an accurate representation of the DOM from the HTML code. The browser may not be able to create an accurate representation of the DOM if the page is poorly written, forcing the browser into rendering the page using a quirks mode. An incorrect representation of the DOM may make it difficult to access and modify the DOM via JavaScript, especially in a cross-browser way. Since HTML does not have a strict compiler, how can you ensure that the HTML code you write adheres to W3C standards Fortunately, a couple of extensions are available for the Firefox Web browser that make it easy to validate your Web pages.
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HTML Validator1 is a Firefox extension that finds and flags errors on an HTML page. HTML Validator is based on Tidy, a tool originally developed by the W3C to validate HTML code. HTML Validator embeds the Tidy tool into Firefox and allows the source code of a page to be validated locally within the browser without sending the code off to a third party. Tidy finds HTML errors and classifies them into three categories: Errors: Problems that Tidy cannot fix or understand Warnings: Errors that Tidy can fix automatically Accessibility warnings: HTML warnings for the three priority levels defined by the W3C Web Accessibility Initiative (WAI) HTML Validator displays the status of the page and the number of errors in the lower-right corner of the browser, providing fast feedback during the development cycle (see Figure 5-2). HTML Validator provides even more help when you view the source of a Web page by accessing the View Page Source menu item. The Firefox view-source window opens as normal, but with HTML Validator enabled, the window includes two new panes (see Figure 5-3). The HTML Errors and Warnings pane lists all the errors found on the page. Clicking any of the items in the list jumps the main source Figure 5-2. HTML Validator window to the location of the problem in the HTML source. summarizes the errors on The Help pane fully describes the problem and offers suga page using an icon on gestions on how you can fix the problem. the status bar.
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1. https://addons.mozilla.org/extensions/moreinfo.php application=firefox&category= Developer%20Tools&numpg=10&id=249
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CHAPTER 5 I BUILDING THE ULTIMATE AJAX DEVELOPER S TOOLBOX
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Figure 5-3. HTML Validator lists the errors in the HTML source code and suggests ways to fix the problem when viewing a page s source.
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The bottom of the Firefox view-source window includes a Clean Up the Page button. This button launches a window that further helps you fix any errors on the page (see Figure 5-4). The Cleanup the Page window opens with four tabs along the top: Cleaned Html, Original Html, Cleaned Browser, and Original Browser. The Cleaned Html tab is the most useful for Web developers. This tab lists the source code of the page after you put the page through HTML Validator for fixing. HTML Validator will do its best to automatically fix all the errors on the page, and the output is listed on this tab. The Original Html tab lists the source code of the page in its original form, before it was processed by HTML Validator. Sometimes fixing the HTML errors on a page will change the way in which the browser renders the page, which may or may not be a desirable effect. The Cleaned Browser tab shows how the page will now look using the fixed source code provided by HTML Validator, while the Original Browser tab displays the page using the original source code. In sum, HTML Validator is a powerful tool that can help you clean up your HTML and make it comply with W3C standards and recommendations. Unfortunately, HTML Validator is available only for Windows platforms. Luckily, another Firefox extension provides similar functionality to HTML Validator and is available on all platforms.
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