Settings API Example

var settingFontSize = ["100%", "130%", "150%"];
var resizeFont = function() {
    var size = document.getElementById("passages");
    switch (settings.fontSize) {
        case "100%":
            size.style.fontSize = "100%";
            break;
        case "130%":
            size.style.fontSize = "130%";
            break;
        case "150%":
            size.style.fontSize = "150%";
            break;
    }
};
Setting.addList("fontSize", {
    label       : "Change font size.",
    list        : settingFontSize,
    default     : "100%",
    onInit      : resizeFont,
    onChange    : resizeFont
});