Answers for "html print js variable"

html use js variable as text

<h1>"My number: " <span id="myText"></span></h1>

<script>

	//You can use an IIFE (Immediately Invoked Function Expression)
	(() => {
  		var number = "123";
		document.getElementById("myText").innerHTML = number;
	})();
</script>

how to print the value of variable in javascript in html

var name="kieran";
document.getElementById("output").innerHTML=name;

and the html code would be: 

<p id="output"></p>

how to print a line in javascript

console.log("Your line would be here")//Prints a line on the console 
alert("Your message here")//Raises an alert