CodePen Embed - YzrXZpL


<p id="demo">Hello World!</p>

<script>
function myFunction() {
  document.getElementById("demo").style.fontSize = "25px"; 
  document.getElementById("demo").style.color = "red";
  document.getElementById("demo").style.backgroundColor = "yellow";        
}
</script>

<button type="button" onclick="myFunction()">Bấm vào!</button>

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