How to change the front of title when mouse over? - javascript

I have a button here and what I want is when mouseover this button, it will show some text automatically.
I use title to achieve this.
The HTML code is:
<oj-buttonset-one id="splitDualYButtonSet" value="{{dualY}}" on-value-changed="[[updateDualY]]" title = "split">
<!-- ko foreach: dualYOptions -->
<oj-option value="[[value]]"><span data-bind="text:label"></span></oj-option>
<!-- /ko -->
</oj-buttonset-one>
when mouseover the button it will show "split" but now the front is too small. How to change the style of the title?
Thanks!

Check this code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script >
function hitMe() {
document.getElementById("hello").innerText="yoo";
};
</script>
</head>
<body>
<button id="hello" onmouseover="hitMe()" >Yes</button>
</body>
</html>

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this.id = 'unique' + i;
this.innerText += i;
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I'm having a tough time with something that I think is pretty simple. I hope you folks can help me.
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<!DOCTYPE html>
<html>
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It works well for me, hope it will resolve your issue.
$("#myDiv").mousedown(function(){
$("#myDiv").mouseup(function(){
$("#myPopUp").show();
});
});
#myPopUp
{
display:none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="myDiv">
hello please select the text and see
</div>
<div id="myPopUp">
popover message
</div>

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