Which framework focuses on DOM and Ajax utilities?

Which HTML element does the location attribute belong to?

What datatype does the async attribute optionally accept?

Examples of React Router components are:

  What is the code required to delete all “weight” tags? 

What will be the output of the following JavaScript code?

document.writeln("
screen.width: "+screen.width);

Which method is used to replace the current history state instead of adding a new state to the browsing history?

What will be the output of the following JavaScript code?

var fruits=["apple","mango","banana"];  

var ans=fruits.shift();  

document.writeln(ans);

What is the output of the following code?

<script>

var x = [1, 2, 3, 4, 5, 6, 7, 8, 9];

var y = x[-1];

var z = x[x.length - 1];

document.write(y + "
" + z);

</script>

How does Virtual DOM work?