bennypowers

  /**
   * Author: Jason Farrell
   * Author URI: http://useallfive.com/
   *
   * Description: Checks if a DOM element is truly visible.
   * Package URL: https://github.com/UseAllFive/true-visibility
   */
  function isVisible(node) {

      'use strict';

bennypowers

// Polymer Starter Kit App
// my-app, in `ready` callback

  if ('serviceWorker' in navigator) {
    navigator.serviceWorker.register('/service-worker.js')
    .then((registration) => {
      registration.onupdatefound = (event) => {
        let installingWorker = registration.installing;

        installingWorker.onstatechange = (event) => {

bennypowers

/* Provide visual feedback of keyboard focus 
 * when paper-button has an image instead of a label 
 */ 
paper-button {
  --paper-button-flat-keyboard-focus: {
        @apply(--shadow-elevation-2dp);
  }
}