// ==UserScript==
// @name         Twitter Image 1-Click Download Background Space
// @version      0.4
// @description  Make the background area of a Twitter-hosted image (like an address ending in .jpg) a clickable download-prompt to image itself. Think of it like 'left click empty space == save-as'.
// @author       Cro
// @match        https://pbs.twimg.com/media/*
// @grant        none
// @namespace https://greasyfork.org/users/10865
// ==/UserScript==
(function () {
'use strict';
var img = document.getElementsByTagName('img')[0];
var body = document.getElementsByTagName('body')[0];
if (img && body)
{
var src = img.getAttribute('src');
if (src)
{
var a = document.createElement('a');
a.setAttribute('href', src);
a.setAttribute('download', src.substr(src.lastIndexOf('/') + 1).replace(/:.*/, ''));
a.style.setProperty('position', 'absolute');
a.style.setProperty('height', '100%');
a.style.setProperty('width', '100%');
a.style.setProperty('z-index', '-1');
body.appendChild(a);
body.onclick = function (evt)
{
if (evt.target == body)
{
a.click();
}
};
}
}
})();