Attempt at loading extra CSS in StackEdit without replacing default.css

test.js

// This doesn't seem to work. The browser only noticed the CSS file if it completely replaced  <link type="text/css" rel="stylesheet" href="res-min/themes/default.css">.
// So, in a worst-case scenario, you can just copy that CSS file, add your changes to it, host it on Github and do the replacement with a UserCustom extension (https://github.com/benweet/stackedit/wiki/UserCustom-extensions).
// Also tried onReady https://github.com/benweet/stackedit/wiki/userCustom.onReady

$(document).ready( function() {
var loadCSS = function(href) {
     var cssLink = $("<link rel='stylesheet' type='text/css' href='"+href+"'>");
     $("head").append(cssLink); 
 };
 
 var path = "url/to/css";

loadCSS(path);

alert("loaded");
} );

// This code might also be useful if you want to target the current StackEdit theme <link>.
$("link").filter( function(elem) { 
    var isStylesheet = $(this).attr("rel") === "stylesheet"; 
    var isDefaultCss = $(this).attr("href").indexOf("res-min/themes/") === 0;
    return isStylesheet && isDefaultCss;
    });