href - where to navigate the user
Possible Values: "relative or full URL string"
target - determines how the window is opened for the destination
Possible Values: "_blank", "_self", "_parent", "_top"
title - advisory text that pops up when the user mouse hovers over the link
Possible Values: "you define text"
rel - specify relationship between the linking file and the destination file
Possible Values: "space separated token list"
hreflang - language of the destination file
Possible Values: "valid language code"
type - mime type of the destination file
Possible Values: "valid mime type"
global attributes - global core attributes
See: list of global attributes
global event handlers - global event handler attributes
See: list of global event handlers