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function delay(time = 500) {
  return new Promise((resolve, reject) => {
    setTimeout(resolve, time);
  });
}

let spinner = document.querySelector('.spinner');
spinner.classList.add('active');

fetch('./books.json')

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const getAllFocusableElements = (parent) => Array.from(parent.querySelectorAll('*')).filter(elm => elm.tabIndex > -1).sort((a,b) => a.tabIndex > b.tabIndex ? 1 : a.tabIndex < b.tabIndex ? -1 : 0);

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// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// http://creativecommons.org/publicdomain/zero/1.0/
(function (win, doc) {
    'use strict';
    if (!win.XMLHttpRequest || !win.FormData || !win.addEventListener || !doc.querySelectorAll) {
        // doesn't cut the mustard.
        return;
    }
    function hijaxForm (formElement) {
        var progressBar;

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// array utils
// =================================================================================================

const combine = (...arrays) => [].concat(...arrays);

const compact = arr => arr.filter(Boolean);

const contains = (() => Array.prototype.includes
  ? (arr, value) => arr.includes(value)
  : (arr, value) => arr.some(el => el === value)

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function ScriptLoader () {
  const loader = url => new Promise((resolve, reject) => {
    const script = document.createElement('script')
    script.src = url
    script.async = !0
    script.addEventListener('load', resolve(script), !1)
    script.addEventListener('error', reject(script), !1)
    body.appendChild(script)
  })
  this.load = url => loader(url)

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javascript:(d=>{var css=`html{background:#fefefe;filter:invert(100%)}*{background:inherit}img:not([src*=".svg"]),video{filter:invert(100%)}`,style,id='dark-theme-snippet',ee=d.getElementById(id);if(null !=ee)ee.parentNode.removeChild(ee);else{style=d.createElement('style');style.id=id;style.styleSheet?style.styleSheet.cssText=css:style.appendChild(d.createTextNode(css));d.head.appendChild(style)}})(document)

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const handleClick = e => {
  if (!modalEl.contains(e.target)) modalEl.hidden = !0
}