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Testing and Troubleshooting
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Use the Validation panel to check the tags in your site for syntax and standards compliance
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and JSP server-side markup Click the Options button to change the level of scrutiny of the validation or to suppress certain kinds of errors
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Comparing Validation with Browser Compatibility
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Although validation and browser compatibility would seem to have much in common, the truth of the matter is that they hardly ever do A page that fails a validation check miserably can work perfectly well in a variety of browsers
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Change the settings of the validation check in the Preferences dialog box
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The Validation panel displays problems with the structure of the code according to official standards, but standards committees aren t in the business of producing browser software Internet Explorer in particular is notorious for letting sloppy HTML code slide, while Netscape has the bad habit of ignoring little-used tags such as <legend> and <label> Some tags, such as <optgroup>, have yet to receive support from any of the major browsers In theory, the best cross-browser, cross-platform, cross-device-compatible code should always comply with markup standards, but in practice you can get away with much The cross-browser-compatible code that Dreamweaver produces routinely fails validation checks! If you have to choose between validation and compatibility, go with compatibility See the next Scenario and Solution sidebar for a quick reference to sum up the differences between compatibility reports and validation reports
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EXERCISE 12-1 Comparing Validation and Compatibility Reports
The time has come to run some diagnostics on the Mad Science LLC site You didn t do any hand coding for this project, so it should be interesting to see how well Dreamweaver fared
1 Launch Dreamweaver, open the Site panel, and select the Mad Science LLC site Double-click the indexhtm file of the home page It opens in a new document window 2 Now open the Validation panel group by choosing Window | Results | Validation 3 Click the green arrow button on the Validation panel and choose Validate Current Document Dreamweaver validates away, and in a moment, your results appear in the Validation panel Don t be alarmed if you see many warnings or alerts One of them says something to the effect that the body tag shouldn t have a marginwidth attribute, yet Netscape uses the marginwidth attribute in the body tag Blame Netscape on that one, not you or Dreamweaver Another one says that HTML 40 deprecates the use of the font tag, which is true enough, although Dreamweaver uses the font tag in HTML styles, and all the major browsers still support the font tag The moral of the story is this: Validation is not the same thing as compatibility
12:
Testing and Troubleshooting
4 Speaking of compatibility, click the Target Browser Check tab and click the green arrow button Choose Check Target Browsers from the menu and choose Microsoft Internet Explorer 40 from the Check Target Browsers dialog box that appears Click OK to run the compatibility check More false positives here One warning says that Internet Explorer 40 doesn t like the marginheight and marginwidth attributes, which is absolutely correct You added those attributes to satisfy Netscape users 5 Another warning states that the target browser doesn t support the type attribute of the script tag Double-click the result for this, and the corresponding page opens in a new document window Remove the highlighted type attribute from the script tag Choose File | Save and then choose File | Check Page | Validate Markup The Validation panel reappears 6 Wouldn t you know it The very type attribute you just removed causes a validation error! Since Internet Explorer 40 simply ignores attributes that it doesn t understand, there s no harm leaving the type attribute in the style tag Choose Edit | Undo to replace the deleted attribute and choose File | Save again Some days you just can t win
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