Advanced Javascript interview questions

1. Difference b/w Html4 and Html5

   Different and difference Doctype

   HTML 5 different Tags

   CSS selectors

   CSS3 animation

   display inline and block difference

   float type and solving issue

   position type and difference

   CSS sudo

   HTML performace

   Html accessablity

   CSS child selector

   image fail handling in UI

   jquery selectors

   jquery event bindings

   event unbindings

   event stoping methods

   differnce in javascript vs jquery selector

   jquery onload

   jquery ajax formats

   this' object and its behaviours in OOJS

   Classes and more questions

   Difference between 'visibility: hidden' and 'display:none'

   Difference between fixed, absolute and relative positions and few questions on this

   Questions on Doctype

   Different browser and document modes

   Where do you keep JS and CSS files on your html page

   sprite images

   z-index and its scenario

   jquery click events

   private,privilaged and public functions and variables based question

   selectors in html

   How do you optimise your page performance

   datatypes in javascript

   prototypes in javascript

   this' object and its behaviours in OOJS

   Difference between Null and undefined

   They will give one scenario and asks for the result about Null and undefined

   "==" and "===" difference

   Again scenario based result will be asked for "==" and "==="

   DOM Manipulations using pure Javascript like "getElementByID" and this is also not straight question scenario based

   Few Questions on Object and questions on object manipulations

   Difference between 'for' and 'for-in' loops again scenario based questions

   Closures and few questions on this

   Classes and more questions

   Hoisting scenarion based questions

   How to implement Inhertance in JS

   How will you define public, protect and private variables and scenario based questions

   How will you access outer finctions object in inner functions

   this' object and its behaviours in OOJS

   One scenario will be given and we need to give optimal solution for that scenario

   Questions on Doctype

   Different browser and document modes

   Difference between 'visibility: hidden' and 'display:none'

   Difference between fixed, absolute and relative positions and few questions on this

   Question on Overflow

   Name few elements of block and inline elements

   Difference between inline and inline-block

   Quirk mode

   How do you optimise your page performance

   Where do you keep JS and CSS files on your html page

   difference between xhtml and html

   Doctype

   browser mode and doc mode

   overflow

   positions and based scenarios

   float

   type of selectors and there precedence

   what is dom

   event delegation

   event capturing and bubbling

   prototypes and scenarios

   closures and scenarios

   new keyword based questions

   private,privilaged and public functions and variables based question

   global scope

   static functions

   constructors

   how many ways to invoke function

   how to ways to create object

   inheritance based questions

   hasownproperty keyword related questions

   DOM Manipulations using pure Javascript like "getElementByID" and this is also not straight question scenario based

   "==" and "===" difference

   Few Questions on Object and questions on object manipulations

   How to implement Inhertance in JS

   What is YUI

   Key Components of YUI

   Find duplicates and their number of occurances in an array

   How to position a div to center using css

   Event Propogation

   Event Bubbling

   Event Delegation

   Event object's functions

   Scope of private variables

   Practical usage of prototyping

   Overriding of prototype object

   new operator usage

   display inline and block difference

   ‘this' object and its behavior’s in OOJS

   Difference between Null and undefined

   Difference between == and ===

   They will give one scenario and asks for the expected results. Ex: var a=10; function add(){ alert(a); var a=20; alert(a); } add();

   this' object related question. this is not straight question they will create some functions and we have to explaining the execution of that functions.

   How many ways to create object in javascript and object related questions

   Questions on typeof and instanceof in js.

   Functions related questions, this is also not straight question

   Difference between margin and padding.

   How to handle dynamic events in javascript

   Variables in javascript

   Conditions in javascript.

   Candidate Self Introduction (on skillset, experience etc…)

   Difference between HTML4 and HTML5

   Explain different Doctypes

   Different HTML5 elements

   CSS3

   CSS3 Animation

   What is Responsive Web Design

   Difference between Block level and Inline elements

   Solving the issues in different Float types

   Different positions in CSS and their difference

   CSS Box Model

   HTML Performace

   Web Accessablity

   jQuery Selectors

   jQuery Event Bindings

   Difference between bind() , live() methods in jQuery

   Event Stoping Methods

   jQuery Ajax Formats

   How you will divide wrapper into Leftnav section and Content section using float,display and position properties of css ?

   null , undefined difference

   Explain event.stopImmediatePropagation(), stopPropagation, preventDefault() methods ?

   How to position a div to center using css

   display inline and block difference and give examples

   Event Bubbling

   Event Delegation

   conditional statemnts --> x || y ==> null ||undefined , 0 ||null and some other combinations of 0 , null, undefined ,-ve numbers, etc

   Scope of variables

   'this'--- based questions

   datatypes in JS

   namespacing in Js and for what purpose we will use it ?

   how will you achieve 'inheritance' in JS

   what happens to page when DTD is not mentioned ..?-- it will go to Quirks Mode

   Result of the following ..? function a(){ return this;} a();

   difference between . and [] operator while accessing object data members and methods ?

   a={k:10,b:function(){ return this;}}; a.b(); -- > Result ?

   a={k:10,b:function(){ return this;}}; var j=a.b();j.b; -- > Result ?

   a={k:10,b:function(){ return this;}}; var j=a.b();j.b(); -- > Result ?

   a={i:10,j:20}; var b=a;b.i=30;console.log(a); -- > Result ?

   a={k:10,b:function(){ return this.k ;}}; var j=a.b();console.log(j);--- 10

   a={k:10,b:function(){ return this.k ;}}; var j=a.b;console.log(j());---- undefined

   function add(){ //function defination for Adding numbers goes here }; add(1,2); add(1,2,3);--> how the function definition access this paraments in the function call ?

   Event capturing

   How do you iterate an object ..?--- by using ' for -in ' loop

   Functional Closures

   Types of Functions

   what is Hoisting in JS

   What is the difference between inline and block?

   Types of css. Which is more efficient?

   typeOf operator. What does it return?

   Functions

   Write a function to find sum of arguments passed. (number of arguments is not fixed)

   Data types

   function a() { return this; } --> Call this function such that value of 10 is returned.

   Questions from projects in Resume

   what will happen if we write DOCTYPE  at the end of the HTML document

   json structure

   CSS specificity

   Different types of function in Javascript

   var x=10; function(){  alert(x); var x=20; alert(x);} what will alert as x

   how to reuse a block of html code using Javascript

   there is one issue in our web page which can be solve by using javascript and css, which one you will use why?

   what are specialities of different javscript frameworks

   object, classes polymorphism

   example based questions on Null and undefined

   datatypes in javascript

   scope of variables

   display inline and inline-block difference

   jquery ajax formats

   What is Responsive Web Design, different tyoes of layouts

   prototypes

   closure functions, why closures

   constructors

   array with different datatypes

   difference between window.onload, document.ready

   How many ways to create object in javascript and object related questions

   declaration and initialization example

   a={k:10,b:function(){ return this;}}; var j=a.b();j.b();

   How to execute part of the javascript code.

   Difference between javascript and jqueary

   local variable vs global variable

   Different DOCTYPE'S

   Event handlers

   Ajax and JSON