Adds Kanji Stroke Order to the Review section of kanji.koohii.com. Tested in Chrome with Tampermonkey.

Koohii Review stroke order

// ==UserScript==
// @name        Kanji.koohii Stroke Order - Review section
// @namespace   koohiireview
// @description Adds Kanjis Stroke Order to the Review section
// @include     http://kanji.koohii.com/review*
// @include     https://kanji.koohii.com/review*
// @version     1.0
// ==/UserScript==


var target = document.querySelector('#uiFcMain');
var stroke_container = ".k-sod";
var inject_container = document.createElement("div");
document.querySelector("#rd-side").appendChild(inject_container);


var observer = new MutationObserver(function(mutations) {
    if (target.classList.contains("uiFcState-1")) {
        
        GM_xmlhttpRequest({
            method: "GET",
            url: "http://www.ig.gmodules.com/gadgets/proxy/refresh=31556926&container=ig/http://tangorin.com/kanji/"+document.querySelector("#kanjibig>p>span").textContent,
            onload: function(response) {
                var responseHTML = new DOMParser().parseFromString(response.responseText, "text/html");
                inject_container.innerHTML = "<br />" + responseHTML.documentElement.querySelector(stroke_container).innerHTML;
            }
        });
    } else {
        inject_container.innerHTML = "";
    };
});


var config = { attributes: true };
observer.observe(target, config);

Updated version that works in the Review and Study sections of kanji.koohii.com is here: https://gist.github.com/shussekaido/3541ab70e37983f0360d