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.
Using In-Line CSS. 1  1. Insert the style attribute into an HTML tag. The attribute style=  allows you to use CSS inside an HML document. 2  2. Specify the color. Insert color: followed by a color name or hex code inside the quotation marks. 3  3. Use CSS classes for styles you use often.