あべねこ

abeneko.js

// Visit http://abehiroshi.la.coocan.jp/
//   then execute these lines via DevTools Console.
let e = document.createElement('img');
e.src = 'https://gist.github.com/assets/25242343/14cbd41c-1ec4-4f13-8bce-ae8a726b2524';
e.style.cssText = 'width: 60%; margin-left: 20%; margin-right: 20%; position: absolute; filter: drop-shadow( 0 0 10px white );';
let eHead = document.getElementsByTagName('head')[0];
eHead.parentNode.insertBefore( e, eHead.nextElementSibling );