To achieve expected result , use below option
Option 1:
1.Create function to hide the div using id
2.Use function on body as onload function
Codepen url for reference- https://codepen.io/nagasai/pen/JNNrpM
Option 2:
1. Make #SecondDiv display:none initially
2. And make it available onclick using display:block
Codepen url for reference- https://codepen.io/nagasai/pen/KmmXez
JS:
var divTwo = document.getElementById('SecondDiv');
function hideDiv(){
divTwo.style.display ='none';
}
function showDiv(){
divTwo.style.display ='block';
}
HTML:
<html>
<body onload="hideDiv()">
<div class="one" id="firstDiv">111
</div>
<div class="Two" id="SecondDiv">222
</div>
<button onclick="showDiv()">show Div Two</button>
</body>
</html>
Option2:
HTML:
<html>
<body>
<div class="one" id="firstDiv">111
</div>
<div class="Two" id="SecondDiv">222
</div>
<button onclick="showDiv()">show Div Two</button>
</body>
</html>
CSS:
.Two{
display:none
}
JS:
function showDiv(){
var divTwo = document.getElementById('SecondDiv');
divTwo.style.display ='block';
}