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NOTE The syntax trees presented earlier look very similar to the parse trees, and they should,
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because any particular parse tree should be derivable from the particular markup language s content model
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Browsers are actually quite permissive in what they will render For example, consider the following markup:
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<TITLE>Hello HTML World</title> <!-- Simple hello malformed world -- example --> </head> <body> <h1>Welcome to the World of HTML</H1> <hr /> <p>HTML <eM>really</Em> isn't so hard! <P>Soon you will ♥ using HTML <p>You can put lots of text here if you want We could go on and on with fake text for you to read, <foo>but</foo> let's get back to the book </html>
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This example misses important tags, doesn t specify encoding types, has a malformed comment, uses inconsistent casing, doesn t close tags, and even uses some unknown element foo However, this will render exactly the same visually as the correct markup previously presented, as shown in Figure 1-3
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Core Markup
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Well-formed Markup
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Malformed Markup
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FIGURE 1-3
Malformed markup works!
1:
Tr a d i t i o n a l H T M L a n d X H T M L
Now if you look at the parse tree formed by the browser, you will note that many of the mistakes appear to be magically fixed by the browser:
PART I
Of course, the number of assumptions that a browser may make to fix arbitrary syntactical mistakes is likely quite large and different browsers may assume different fixes For example, given this small fragment of markup
<p>Making malformed HTML <em><strong>really<em><strong> isn't so hard!</p>
leading browsers will form their parse trees a bit differently, as shown in Figure 1-4
Part I:
Core Markup
FIGURE 1-4
Same markup, different parse, as shown in Firefox 3 (above) and Internet Explorer 8 (below)
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Tr a d i t i o n a l H T M L a n d X H T M L
Simply put, it is quite important to aim for correct markup as a solid foundation for a Web page and to not assume the markup is correct just because it appears to render correctly in your favorite browser
PART I
Validation
As shown earlier, a DTD defines the actual elements, attributes, and element relationships that are valid in documents Now you can take a document written in (X)HTML and then check whether it conforms to the rules specified by the DTD used This process of checking whether a document conforms to the rules of the DTD is called validation The <!DOCTYPE> declaration allows validation software to identify the HTML DTD being followed in a document, and verify that the document is syntactically correct in other words, that all tags used are part of a particular specification and are being used correctly An easy way to validate a document is simply to use an online service such as the W3C Markup Validation Service, at http://validatorw3org If the malformed example from the previous section is passed to this service, it clearly shows that the page has errors:
Part I:
Core Markup
Pass the URL to the service yourself by using this link in the address bar:
http://validatorw3org/check uri=http%3A%2F%2Fhtmlrefcom%2Fch1%2Fmalforme dhelloworldhtml
By reading the validator s messages about the errors it detected, you can find and correct the various mistakes After all mistakes are corrected, the document should validate cleanly:
Web developers should aim to start with a baseline of valid markup before trying to address various browser quirks and bugs Given that so many Web pages on the Web are poorly coded, some developers opt to add a quality badge to a page to show or even prove standards conformance:
1:
Tr a d i t i o n a l H T M L a n d X H T M L
Whether users care about such things is debatable, but the aim for correctness is appropriate Contrast this to the typical effort of testing a page by viewing it in various browsers to see what happens The thought is, if it looks right, then it is right However, this does not acknowledge that the set of supported or renderable pages a browser may handle is a superset of those which are actually conforming to a particular specification:
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