Dispatching captured events works but not when I've created them myself (HumanBenchmark)

Question

So I've been trying to get the highest possible score on the Typing test on HumanBenchmark but ran into some oddities when trying to dispatch custom keybaordEvents.

I only got it working if I captured user inputs and then dispatched them again, but I don't understand why creating my own events won't work. HumanBenchmark don't seem to be checking the isTrusted flag since that is false in both scenarios.

Working code:

let vTarget = document.getElementsByClassName("letters")[0]
let vKeyEvents = {}
document.addEventListener("keydown", 
    function(e){
        vKeyEvents[e.key] = e
    }
);

function run(){
    vText = vTarget.innerText
    for (let index = 0; index < vText.length; index++) {
        vTarget.dispatchEvent(vKeyEvents[vText[index]])
    }
}

How to run my code (Demonstration):

• Goto HumanBenchmark Typing test
• Paste the above code
• Click on anything in the dom except text box
• Press every letter on your keyboard including capitals and symbols used in the text.
• type run() in the console

Code I used for creating KeyboardEvents that isn't working

vTest = new KeyboardEvent('keydown', 
    {
        key:"t", 
        keyCode:84, 
        isComposing: true, 
        view:window
    });
document.getElementsByClassName("letters")[0].dispatchEvent(vTest)

Answer 1

Add bubbles: true to the KeyboardEvent options

new KeyboardEvent('keydown', 
    {
        key:"t", 
        keyCode:84, 
        isComposing: true, 
        view:window,
        bubbles: true
    })