The === operator compares two values, without taking into account their types. == compares the values, but also makes their types into account.

Do I really need to reply this?

The == operator compares two values, without taking into account their types. === compares the values, but also makes their types into account.

The == operator is used to assign a value to a variable. === is used to compare the values of two variables.

Is an open standard file format, and data interchange format, that uses human-readable text to store and transmit data objects consisting of attribute–value pairs and array data types

Is the standard markup language for documents designed to be displayed in a web browser. It can be assisted by technologies such as Cascading Style Sheets (CSS) and scripting languages such as JavaScript

Is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable

The Document Object Model is a cross-platform and language-independent interface that treats an XML or HTML document as a tree structure wherein each node is an object representing a part of the document

There are seven data types: Boolean, Null, Undefined, Number, String, Symbol, Object.

There are eighth data types: Boolean, Null, Undefined, Number, String, Symbol, Object, Date.

There are nine data types: Boolean, Null, Undefined, Number, String, Symbol, Object, Date, JSON.

Sorry, what do you mean by data type?

Alert, Redirect and Prompt

Alert, Confirm and Prompt

Nice try, a pop-up can be done only using jquery or a similar library

Alert, Confirm, Redirect and Prompt

HTML tags are composed of three things: an opening tag, content and ending tag. Some tags are unclosed tags.

HTML tags are composed of three things: an opening tag, content and ending tag. All tags need to be closed.

HTML tags define metadata about an HTML document. Metadata is data (information) about data.

I didn't know that I was supposed to be studying

This adds a red border over the input box for the user to visually recognize that it is required.

It forces a user to fill text on the text field or text area before submitting the form. It is used for form validation. But, the "required" attribute is not properly written in this example.

It would be nice to have that functionality, but due to browser compatibility it does not work and manual validation is required.

It forces a user to fill text on the text field or text area before submitting the form. It is used for form validation.

The new input types for form validation are text, textarea, radio, email, URL, number, tel, and date.

The new input types for form validation are text, area, radio, email, URL, number, tel, and date.

The new input types for form validation are email, URL, number, tel, and date.

All these options are available since previous versions of HTML.

document.getElementById('some-div-id').innerHTML="<h2>This is heading using JavaScript</h2>";

document.getElementById('some-div-id').innerHTML.val("<h2>This is heading using JavaScript</h2>";)

document.getElementById('some-div-id').innerHTML.html("<h2>This is heading using JavaScript</h2>";)

document.getElementByTagName('some-div-id').innerHTML="<h2>This is heading using JavaScript</h2>";

102030 because since there is a string, all the + will be treated as string concatenation operator (not binary +).

102030 because before you perform arithmetic operations you would have to explicitly convert those values to an actual number.

That will throw an unhandled exception, a try catch block is required to prevent it.

3030 because 10+20 will be 30. If there is numeric value before and after +, it treats as binary + (arithmetic operator).

<form name="myform">

<a href="javascript: document.myform.submit();">Submit</a>

</form>

<form name="myform">

<button type="button" onclick="javascript: document.myform.submit();">Click Me!</button>

</form>

<form name="myform">

<input type="submit" value="Submit">

</form>

<form name="myform">

<span id="link" onclick="javascript: document.myform.submit();"></span>

</form>

The getElementsByName() method returns a live HTMLCollection of elements with the given tag name.

The getElementsByTagName() method returns a collection of all elements in the document with the specified name (the value of the name attribute), as an HTMLCollection object.

The innerHTML property sets or returns the text content of the specified node, and all its descendants.

The innerText property sets or returns the HTML content of an element.

let allows you to declare variables that are limited to the scope of a block statement, or expression on which it is used, unlike the var keyword, which declares a variable globally, or locally to an entire function regardless of block scope

The difference between POST and PUT is that POST requests are idempotent. That is, calling the same POST request multiple times will always produce the same result. In contrast, calling a PUT request repeatedly have side effects of creating the same resource multiple times.