Definition and Usage. The.class selector styles all elements with the specified class. 5.8 Attribute selectors. CSS 2.1 allows authors to specify rules that match elements which have certain attributes defined in the source document. Learn how to use type, class, and ID selectors to style any element in your document. Class and ID Selectors. For the CSS Beginner Tutorial we looked solely at HTML selectors - those that represent an HTML tag. You can also define your own selectors in. Selecting elements on the basis of their class names is a very common technique in CSS. The attribute selector syntax [class~= warning ] is rather awkward, but. Can you spot the difference between these two selectors? header.callout header.callout They look nearly identical, but the top one has no space Pattern Meaning Described in section First defined in CSS level * any element Universal selector: 2 E an element of type E CSS Selectors. CSS selectors allow you to select and manipulate HTML elements. CSS selectors are used to find (or select) HTML elements based on their id, class. When you create a new style in Dreamweaver using CSS features, you will need to choose which type of style you want to create and which ‘selector’ you want to use. I have a bunch of elements with a class name red: p class= red /p div class= red /div I can't seem to select the first element with the.