JSFiddle - React, Tailwind, and code Playground

HTML

<pre id="pre1">
  animation.runMovementAnimation(mySprite, [], 500, false);
</pre>

JavaScript

/* message signatures
export interface RenderBlocksRequestMessage extends SimulatorMessage {
    type: "renderblocks",
    id: string;
    code: string;
    options?: {
        package?: string;
        packageId?: string;
        snippetMode?: boolean;
    }
}

export interface RenderBlocksResponseMessage extends SimulatorMessage {
    source: "makecode",
    type: "renderblocks",
    id: string;
    svg?: string;
    width?: number;
    height?: number;
}*/

var makeCodeRenderPre = makeCodeRenderPre || (function () {
    // pre waiting to be rendered
    // when undefined, iframe is loaded and ready
    var pendingPres = [];
    function injectRenderer() {
        var f = document.getElementById("makecoderenderer");
        // check iframe already added to the DOM
        if (f) {
            return;
        }
        var f = document.createElement("iframe");
        f.id = "makecoderenderer";
        f.style.position = "absolute";
        f.style.left = 0;
        f.style.bottom = 0;
        f.style.width = "1px";
        f.style.height = "1px";
        f.src = "https://arcade.makecode.com/--docs?render=1"
        document.body.appendChild(f);
    }

    function renderPre(pre) {
        console.log('render ' + pre.id)
        var f = document.getElementById("makecoderenderer");
        // check if iframe is added and ready (pendingPres is undefined)
        if (!f || !!pendingPres) {
            // queue up
            pendingPres.push(pre);
            injectRenderer();
        } else {
            f.contentWindow.postMessage({
                type: "renderblocks",
                id: pre.id,
                code: pre.innerText,
                options: {
                	packageId: pre.getAttribute("pub")
                }
            }, "https://arcade.makecode.com/");
        }
    }

    // listen for messages
    window.addEventListener("message", function (ev) {
        var msg = ev.data;
        if (msg.source != "makecode") return;

       ...