proof glitched js/html on plus.shonenjump.com for UserScript

jplus-editor-in-chief.user.js

// ==UserScript==
// @name        J+ editor-in-chief
// @namespace   http://noromanba.flavors.me
// @description proof glitched js/html on plus.shonenjump.com for UserScript
// @include     http://plus.shonenjump.com/rensai_detail.html*
// @grant       none
// @noframes
// @run-at      document-idle
// @version     2016.04.24.2
// @homepage    https://gist.github.com/noromanba/fa888fc754a4c4cb34a420c007b1ad4a
// @downloadURL https://gist.github.com/noromanba/fa888fc754a4c4cb34a420c007b1ad4a/raw/jplus-editor-in-chief.user.js
// @license     MIT License http://nrm.mit-license.org/2016
// @author      noromanba   http://noromanba.flavors.me
// @icon        https://upload.wikimedia.org/wikipedia/commons/thumb/a/ad/Pictograms-nps-pets_on_leash-2.svg/64px-Pictograms-nps-pets_on_leash-2.svg.png
// ==/UserScript==

// Icon (PD by NPS Graphics, ZyMOS)
// https://commons.wikimedia.org/wiki/File:Pictograms-nps-pets_on_leash-2.svg
//  United States National Park Service
//  https://www.nps.gov/

// Devel
// https://gist.github.com/noromanba/fa888fc754a4c4cb34a420c007b1ad4a


(() => {
    'use strict';

    const clickale = () => {
            Array.from(document.body.querySelectorAll('a.btn_list_detail'), container => {
            // ".standreading_link" is lazy, can't access DOMContentLoaded
            // i.e. fail in @run-at document-end, use w/ @run-at document-idle or lazyload
            const link = (container.querySelector('a.standreading_link[href]') || {}).href;
            if (!link) return;

            container.href = link;
            container.target = '_blank';
        });
    };
    clickale();
})();

// DBG
// viewer syntax;
// http://plus.shonenjump.com/client_info/SHUEISHA/html/player/viewer.html?tw=1&lin=1&cid=<CONTENT_ID>
//
// e.g.
// http://plus.shonenjump.com/rensai_detail.html?item_cd=SHSA_JP01PLUS00002066_57
//
//      <a class="btn_list_detail cf">
//        <img src="/client_info/SHUEISHA/itemimage/SHSA_JP01PLUS00002213_57_cover.jpg" alt="" class="list_detail_image nosave" unselectable="on" width="100%"></img>
//          <!-- snip -->
//          <div class="btn_list_detail_read">
//            <span class="look_inside invisible"><!-- snip --></span>
//            <span class="content_id invisible">SHSA_JP01PLUS00002213_57</span>
//             <a class="standreading_link" href="http://plus.shonenjump.com/client_info/SHUEISHA/html/player/viewer.html?tw=1&;lin=1&;cid=SHSA_JP01PLUS00002213_57" target="_top">
//               <img style="display: none ! important;" src="/client_info/SHUEISHA/view/userweb/assets/blank.gif?timestamp=1457085568000"></img>
//             </a>
//          </div>
//        <!-- snip -->
//     </a>