Im a little confused about what your asking, based of your first post.
You'd like to play an audio file when someone clicks a icon on your website that is html?
You can do this by attaching javascript to the onclick
parameter of the icon.
<!-- Your Play Button -->
<i class="fa fa-play pointer" onclick="playsound()"></i>
<!-- Your audio source -->
<audio id="audio" style="display:none" src="audio_source.ogg" ></audio>
<!-- Your javascript function -->
<script>
function playsound(){
var audio = document.getElementById("audio");
audio.play();
}
</script>
<!-- Sourced from https://stackoverflow.com/questions/18826147/javascript-audio-play-on-click -->
Further expanding on that, you may want to add css (style rules) to your icon to display a curser.
<style>
.pointer{
cursor:pointer;
}
</style>