Test cases: assigning external CSS to an HTML document with the @import rule in a style element. There are test cases with single or double quotes, with or without the url() syntax. The style element may have a media attribute. E.g. (HTML, CSS):
<style type="text/css" media="all"> @import 'css/import_sq_m_all.css'; </style>
See the HTML 4.01 Specification for more information on the style element and the media attribute. See the CSS Level 2 Specification for more information on the @import rule.