get em size JS

by bitstarr

JavaScript

function getEmSize(el) {
    return Number(getComputedStyle(el, '').fontSize.match(/(\d+(\.\d+)?)px$/)[1]);
}
el = document.querySelector('body');
getEmSize(el);


/*
get mq from css


ruleList = document.styleSheets[2].cssRules;
mediaQueries = [];

for ( j=0; j<ruleList.length; j++ ) {
    if ( ruleList[j].type == CSSRule.MEDIA_RULE ) {
        mediaQueries.push( ruleList[ j ].media.mediaText );
    }
}

mediaQueries;