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rect(0, 20px, 20px, 0)

The only values permitted with rect(...) arelength values and auto, which is the same as"set the clipping edge to the appropriate content edge."Thus, the following two statements mean the same thing:

overflow-clip: rect(auto, auto, 10px, 1cm);overflow-clip: rect(0, 0, 10px, 1cm);

It is possible to set negative lengths, though, which will expand the

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By not predefining any tags in the XML Recommendation, the W3C allowed developers full control over customizing their data as they see fit. This makes XML very attractive to encoding data that already exists in legacy databases (by using database metadata, and other schema information). This extensibility of XML makes it such a great fit when trying to get different systems to work with each other.

XML supports shareable structure (using DTDs)

Since the structure of the XML document can be specified in DTDs they provide a simple way to make it easier to exchange XML documents that conform to a DTD. For example, if two software systems need to exchange information, then if both of the systems conform to one DTD, the two systems can process information from each other. DTDs are not as powerful as some kind of schema architecture for XML, they don't support typing, subclassing, or instantiation mechanisms that a schema architecture must have.

DTDs are a simple way to make sure that 2 or more XML documents are of the same "type". Its a very limited approach to making "typed" XML documents shareable across systems. In the future some kind of schema system will be proposed by the W3C that should allow typing, instantiation and inheritance of information (in XML).

Let's explore this in a little more detail. Assume the following:

/* reader styles */
BODY {color: white; background-color: black;}
/* author styles */
BODY {color: black;}

Since, in this circumstance, the author's styles will outweigh the reader's styles -- that's how it is under CSS1, anyway -- then the new style sheet for this document will be as



italic | oblique | normal

up with the middle of the inline boxes of the other text in the line. Because the inline boxes are all 12px tall, and their middles are all lined up, this means that the line box for this line is now only 12 pixels high, just like the others. However, it also means that the oversized text intrudes into other lines even more than before.

Let's consider another situation where another inline element is in the same line as the boldfaced text, but its alignment is other than the baseline: