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Table Of Contents
Drupal 6 Theming Cookbook
Validation is an integral part of web development. HTML and CSS validation ensure that the document is structurally and semantically correct and provide a reliability guarantee that the page will be displayed correctly, both now and in the future.
In this recipe, we will look at how the Web Developer add-on provides easy options for validating both HTML and CSS using the W3C validator at http://validator.w3.org.
It is assumed that the Web Developer add-on is installed and enabled in Firefox.
To validate the HTML of a page currently being viewed in Firefox, click on the Tools menu of the Web Developer toolbar and select Validate HTML as displayed in the following screenshot:

Once clicked, we will be redirected to the W3C validator page to view the results of the check.
Similarly, validating the CSS of a page currently being viewed can be performed by clicking on the Tools menu of the toolbar and selecting Validate CSS.
Validating...
Change the font size
Change margin width
Change background colour