Photo credit: Danika Bannasch, UC Davis. Hereditary equine regional dermal asthenia (HERDA) is a genetic skin disease found in the Quarter Horse. The disease is characterized by hyperextensible, elastic skin, severe dermatologic lesions, and often scarring along the back and withers of affected horses.
Contents. 1  Introduction to style sheets. 2  Adding style to HTML Setting the default style sheet language. 3  External style sheets Preferred and alternate style sheets.  Cascading style sheets Media-dependent 1  cascades. Hiding style data from user agents.  Linking to style sheets with HTTP headers.
To apply a style rule to a particular HTML element in the <BODY> section of your Web page, add a CLASS or ID attribute to the opening tag of the element whose value is the selector for the desired CSS style rule. You also can add CSS font attributes directly to HTML elements that support the STYLE attribute. Note If you define a BODY {} style, all of the text on the page that is not formatted by an inline style will be displayed in the style specified. To prepare to build a CSS font style. Open an external CSS style sheet document for editing, and follow the procedures in the topic Building CSS Styles.