JSFiddle - React, Tailwind, and code Playground

HTML

<html>

<script>


M = 'MarkA1' + '<br>' + 'Mark2B' + '<br>' 
K = 'Kamoto2B'+ '<br>' + 'KatomoYZ'+ '<br>'
R = 'RennerH8'+ '<br>' + 'RennerWTB'+ '<br>'
W = 'Will3tG' + '<br>'

Z1 = 'MarkA1' + '<br>' + 'Will3tG'+ '<br>'
Z2 = 'Mark2B'+ '<br>'
Z3 = 'Kamoto2B'+ '<br>'
Z4 = 'RennerH8'+ '<br>' + 'RennerWTB'+ '<br>'
</script>

<script>

a=0
b=0
c=0
d=0
r=0
p=0
z=0
x=0

        function myFunction() {
        if(a % 2 == 0){
          document.getElementById('h1').innerHTML += M
        }

        else {
          document.getElementById('h1').innerHTML = document.getElementById('h1').innerHTML.replace(M, '')
        }
        a++
}

        function myFunction2() {
        if(b % 2 == 0){
          document.getElementById('h1').innerHTML += K
        }
        else {
          document.getElementById('h1').innerHTML = document.getElementById('h1').innerHTML.replace(K, '')
        }
        b++
}
function myFunction3() {
        if(c % 2 == 0){
          document.getElementById('h1').innerHTML += W
        }
        else {
          document.getElementById('h1').innerHTML = document.getElementById('h1').innerHTML.replace(W, '')
        }
        c++
}
        
function myFunction4() {
        if(d % 2 == 0){
          document.getElementById('h1').innerHTML += R
        }
        else {
          document.getElementById('h1').innerHTML = document.getElementById('h1').innerHTML.replace(R, '')
        }
        d++
}

        function myFunction5() {
        if(r % 2 == 0){
          document.getElementById('h1').innerHTML += Z1
        }
        else {
          document.getElementById('h1').innerHTML = document.getElementById('h1').innerHTML.replace(Z1, '')
        }
        r++
}

        function myFunction6() {
        if(p % 2 == 0){
          document.getElementById('h1').innerHTML += Z2
        }
        else {
          document.getElementById('h1').innerHTML = document.getElementById('h1').innerHTML.replace(Z2, '')
        }
        p++
}
function myFunction7() {
...