futtta / autoptimize

            // ! in the first position of the comment means preserve

            // so push to the preserved tokens keeping the !

            if ($this->keepImportantComments && strpos($comment, '!') === 0) {

                $preservedTokenId = $this->registerPreservedToken($comment);

                // Put new lines before and after /*! important comments

                $css = str_replace($commentIdString, "\n/*$preservedTokenId*/\n", $css);

                continue;

            }

            // # sourceMappingURL= in the first position of the comment means sourcemap

            // so push to the preserved tokens if {$this->keepSourceMapComment} is truthy.

            // # sourceMappingURL= in the first position of the comment means sourcemap

            // so push to the preserved tokens if {$this->keepSourceMapComment} is truthy.

            if ($this->keepSourceMapComment && strpos($comment, '# sourceMappingURL=') === 0) {

                $preservedTokenId = $this->registerPreservedToken($comment);

                // Add new line before the sourcemap comment

                $css = str_replace($commentIdString, "\n/*$preservedTokenId*/", $css);

                continue;

            }

            // Keep empty comments after child selectors (IE7 hack)

            // e.g. html >/**/ body