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.
HTML Tags. HTML markup tags are usually called HTML tags. * HTML tags are keywords (tag names) surrounded by angle brackets like <html>. * HTML tags normally come in pairs like <b> and </b>. *The first tag in a pair is the START tag, the second tag is the END tag.