With the attribute selector and the lens

What are the properties through use?
　　1, ID page elements unique identifier
　　2, class definitions element selector
　　3, inline style defines a label is
　　displayed label contents 4, title mouse moved into the element
CSS What are selectors
　　1, a derived selector (in HTML tag stated)
　　2, ID selector (with the DOM id stated)
　　3, class selector (with a style class name stated)
　　4, property selector (belonging css2, IE6 does not support, not used)
　　5, and iterated selector (Lane separated by spaces, such as {} II.A div)
　　. 6, group selector (using commas to separate, such as p, div. # a {} )
definition of priority
　　id> class> tag> *
　　the special selector, the higher its priority, that is, the selector pointed to the more accurate, the higher its priority