deulseobs

This also doesn’t not work, if I wanted to specify a media query for that element:

function wpb_hook_javascript() {
  if (is_front_page ()) { 
    ?>
        <script type="text/javascript" src='jquery.min.js?ver=3.5.1'>
		if (matchMedia("(max-width: 760px)").matches) { 
			// the viewport is at most 760 pixels wide 
			$('#header.header-front-page').css('background-size', '100%!important')
        }
        </script>
    <?php
  }
}
add_action('wp_head', 'wpb_hook_javascript');