这里面有一些东西可以尝试stackoverflow thread. 我正在尝试的是：

add_filter(\'tiny_mce_before_init\', \'vsl2014_filter_tiny_mce_before_init\');
function vsl2014_filter_tiny_mce_before_init( $options ) {

    if ( ! isset( $options[\'extended_valid_elements\'] ) ) {
        $options[\'extended_valid_elements\'] = \'style\';
    } else {
        $options[\'extended_valid_elements\'] .= \',style\';
    }

    if ( ! isset( $options[\'valid_children\'] ) ) {
        $options[\'valid_children\'] = \'+body[style]\';
    } else {
        $options[\'valid_children\'] .= \',+body[style]\';
    }

    if ( ! isset( $options[\'custom_elements\'] ) ) {
        $options[\'custom_elements\'] = \'style\';
    } else {
        $options[\'custom_elements\'] .= \',style\';
    }

    return $options;
}