Switches off all the remote stylesheets, so you can see how you page looks with only inlined CSS. ( function ( ) { var styles = document .querySelectorAll( 'link[rel=\'stylesheet\']' ); for ( var s = 0 ; s < styles.length; s++) { styles[s].mediax = styles[s].media; if (styles[s].media === 'only x' ) { styles[s].media = styles[s].mediax; } else if (styles[s].media !== 'print' ) { styles[s].media = 'only x' ; } } })();