Star Hack
Versions 7 and below of Internet Explorer recognize properties which are preceded by non-alphanumeric characters except an underscore or a hyphen (after discarding the prefix). All other browsers ignore such properties as invalid. Therefore, a property that is preceded by an non-alphanumeric character other than an underscore or a hyphen, such as an asterisk, is applied exclusively in Internet Explorer 7 and below.
#elem { width: ; *width: ; }This hack uses invalid CSS and there are valid CSS directives to accomplish a similar result. On the other hand, this hack doesn't change the specificity of a selector making maintenance and extension of a CSS file easier.
Read more about this topic: CSS Filter
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—Ralph Waldo Emerson (1803–1882)
“I was gonna call it “I Love You, Samantha” but some old hack got there before me.”
—Blake Edwards (b. 1922)