    def test_sneaky_import_in_style(self):
        # Prevent "@@importimport" -> "@import" replacement.
        style_codes = [
            "@@importimport(extstyle.css)",
            "@ @  import import(extstyle.css)",
            "@ @ importimport(extstyle.css)",
            "@@  import import(extstyle.css)",
            "@ @import import(extstyle.css)",
            "@@importimport()",
        ]
        for style_code in style_codes:
            html = '<style>%s</style>' % style_code
            s = lxml.html.fragment_fromstring(html)

            cleaned = lxml.html.tostring(clean_html(s))
            self.assertEqual(
                b'<style>/* deleted */</style>',
                cleaned,
                "%s  ->  %s" % (style_code, cleaned))
The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.