However, CSS handling isn??™t according to specification and can make troubleshooting problems
much more difficult. By writing valid HTML, browsers use a Strict mode that is intended to meet the
W3C specifications. This results in a more reliable rendering across browsers.
If you want to test whether the HTML you have written is valid, many applications such as Adobe
Dreamweaver have built-in validation tools. You can also use the W3C HTML Validation Service (see http://
validator.w3.org).
Semantic HTML
Semantic HTML is an important and crucial point that often gets lost in the idea of creating
valid HTML. Using semantic HTML means using elements that are appropriate for the content
that it contains.
This is important for a few reasons. For one, those who use assistive technologies such as
screen readers will have an easier time navigating your page and will also get a more natural
read. Without the additional elements, the page would blur into one large block of text.
Semantic HTML also gives users more control over the page. Many designers shudder
over the possibility of users messing with their finely crafted masterpieces, but trust me, it??™s
a good thing. Designers and developers are continually making assumptions about how functional
something is. It is assumed that they??™ll understand that something is a button or that
the text is large enough. People can use user style sheets or tools (for example, Greasemonkey,
a plug-in that enables users to run custom scripts on any page) to improve the readability or
usability of your site or application to suit their own needs.
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