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most common errors when programming Xhtml

1. 
   
   Removes HTML code elements that only serve to change the visual aspect of presentation. For example, to mark the emphasis use EM and STRONG elements that provide structural information, instead of B and R, which provide only visual appearance (bold italics).
   


2. 
   
   Remember: The strict grammars disapprove presentation elements like B, I, CENTER, etc.
   


3. 
   
   not use structural elements to format text. For example, instead of using markup BLOQUOTE citation or Q to achieve the effect of indented text, make use of CSS properties for that purpose ("text-indent").
   


4. 
   
   Use CSS to style text, instead of representing through images. A text in an image is no longer available for those who can not see it. If you use this technique adds the same text on the image to the same alternative text (alt attribute).
   


5. 
   
   Avoid using tables for layout. Instead use structural markup and style sheets to control layout of the document. Remember the comments about layout tables in unit 4 and the example of layout using CSS.
   


6. 
   
   Evita add white space or by the entity
   empty cells in tables to give them proper borders. Use the property "empty-cells."
   


7. 
   
   not add spaces ("nbsp;") for margins to the content of an element. Instead, it uses the CSS property "margin" "margin-top", "margin-right", "margin-bottom" and "Margin-left".
   


8. 
   
   uses the CSS property "text-align: center" instead of nonstandard element
   CENTER.