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The W3C CSS Validation Service

-- the W3C CSS Validation Service; a free service that checks Cascading Style Sheets (CSS) in (X)HTML documents or standalone for conformance to W3C recommendations.

Note: If you want to validate your CSS style sheet embedded in an (X)HTML document, you should first check that the (X)HTML you use is valid.

The W3C Markup Validation Service
then I found Simple CSS — A Free CSS Authoring Tool
Cascading Style Sheets (CSS) is a good way to specify the styles of fonts and other page elements on your sites. It makes it easier for you to update styles too, because when done right, you only need to make a single change to update the styles on multiple pages and elements.

Another bonus is that your visitor's browser needs to load less data per page, helping you reduce your data transfer usage while serving the same information. That means you'll be able to accommodate more site visitors without having to spend more on data transfer. Your pages will also load faster.

To help you work with CSS, we've created a free tool called Simple CSS, which runs on Macs, Windows and Linux. Simple CSS allows you to easily create Cascading Style Sheets from scratch, and/or modify existing ones, using a familiar point-and-click interface.

With Simple CSS, you can manage multiple CSS projects and import your existing style sheets. Simple CSS supports CSS2.

Google Search: Cascading Style Sheets

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