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. Stands for Hypertext Markup Language.. HTML is the language used to create webpages. Hypertext refers to the hyperlinks that an HTML page may contain. Markup language refers to the way tags are used to define the page layout and elements within the page.Below is an example of HTML used to define a basic webpage with a title and a single paragraph of text. TechTerms.com. This is an example of a paragraph in HTML.arkup language refers to the way tags are used to define the page layout and elements within the page. Below is an example of HTML used to define a basic webpage with a title and a single paragraph of text. TechTerms.com. This is an example of a paragraph in HTML.