https://jsfiddle.net/ffkwgddL/
In the code, I have three buttons named first-button, second-button, and third-button. If the first-button (introduction) is clicked and then the space bar is pressed, it functions as if the first button was clicked again. However, if the first button is clicked followed by the third button (click to get next content) and then the spacebar is pressed, it acts as though the third button was clicked. I desire the space bar and enter keys to work exclusively for the third button and not for any other button. Apologies for the appearance of the fiddle, which was designed solely for landscape viewing.
<body>
<div class="container" id="wrapper">
<div class="top">
<div class="heading">
<h1>Multiples</h1>
</div>
</div>
<!-- Rest of the HTML code follows... -->
</div>
</body>
</html>