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.
MIME types and stylesheets. Web servers send a HTTP response header named Content-Type that specifies the MIME-type of the file that is being sent. For security and standards-compliance reasons, style sheets should be delivered with the text/css MIME type. Starting with IE9 Standards mode, style sheets will be ignored (not applied) unless they are delivered with a text/css MIME type.