Which event can be used to validate the value in a field as soon as the user moves out of the field by pressing the tab key?

Is the following statement regarding expression closures in JavaScript true or false? The syntax function(x) {return x*x;} can be written as function(x) x*x.

How can the user's previously navigated page be determined using JavaScript?

Which statement regarding this String prototype is correct? String.prototype.doSomething = function(suffix) { return this.indexOf(suffix, this.length - suffix.length) !== -1; };

Choose another way to write x ? a = b : a = c

Which is incorrect regarding Strict mode in JavaScript?

What does the following statement do? document.title = 'JavaScript';

Consider the following JavaScript alert: You want the user to see the above message upon opening the page. How will you implement this?

You've embedded the document.write() method to write some text within a pair of table tags. Upon loading the file, however, you get some garbled junk on the page where that text should be. What could be the reason for this?

Difference between calling a JavaScript function directly like onclick = 'a()' and onclick='JavaScript:a()' where a() is a function written in JavaScript?

You are allowing the user to upload image files. You want to be able to capture the attributes of the image such as width and height using JavaScript. How would this be possible?