Javascript if document contains alert

So I'm doing a quiz.And i want to check if || while document contains alert.So if the document contains alert then i want to append my Button Next.So this is my idea:

if(document.contains(alert)) {
            const buttonNext = document.createElement("button")
            buttonNext.innerText = "Next"
        } else {
            !document.append(buttonNext)
        }

This is the quiz section:

const myBtns = document.querySelectorAll('.Btn')
myQuestionAndAnswers.forEach(item => {
    const myAnswers = item.Answers
    const myQuestion = item.Question
    const mySecondStage = item.SecondStage
    myFunctionForOptions(myAnswers , myQuestion)
})

function myFunctionForOptions(answers, question) {
   const [firstObj, secondObj] = answers // ES6 definening 2 Object in one const variable
   let j
   const remainder = 30 % answers.length + 2
   console.log(remainder)
   for(j = 0;j < (myBtns.length / answers.length + remainder);j++) { //Replacing my Buttons with j
       const typeOfInput = myBtns[j].getAttribute('value') // Getting the value of the input
      myBtns[j].addEventListener('click', (e) => {
          console.log(e.target)
        if(firstObj.option == typeOfInput) { //Checking if the firstObj is the same as the value of the input
        const myTrueAnswer = alert('Hey you got the answer right.Congratulations🎉!')
        } else {
         const myFalseAnswer = alert('You got the answer wrong try next time😔...')
        }

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