Tuesday, October 21, 2008

Visual Studio 2008 and XHTML Validation

In Visual Studio 2008 the Default.aspx page you get when you create a new web site has the following statement regarding HTML document:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

For exmaple, in order to get the following:

<hr width="800px" align="left" / >

older type html fragment to work, you need to use the following which conforms to CSS 2.0:

<hr style="text-align:'left'; width:'800px'"/>

However, VS2008 produces this error during validation:

Error 1 Validation (CSS 2.0): ''800px'' is not a valid value for the 'width' property.

In CSS 2.0, the width can have the following values, auto | a unit| inherit

However instead of inline styling if you use the style (generated by the IDE) as in::

<style type='text/css'>
font-family: 'Times New Roman' , Times, serif;
text-align: left;
height: auto;
visibility: visible;
display: inline;
width: 400px;

 you will not get this validation error.

Note that in older browsers IE treated hr as an inline element, while the others treated it as a block element.

I have often come across the validation errors in VS 2008. If you do come across them look up this useful reference:



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