yaquawa

function extract_characters_by_font(font_name) {
    var allElems = document.querySelectorAll('*');
    var characters = Array.prototype
            .filter.call(allElems, function (elem) {
                var fonts = getComputedStyle(elem)['font-family'].split(',').map(function(font){
                    return font.trim().replace(/'/g,'');
                });
                return fonts.indexOf(font_name) > -1;
            })
            .map(function (elem) {