HTML 5 Semantic Elements and JavaScript Basics

There are two category of HTML 5 elements listed below.

  • Block level elements
  • Inline elements

Block elements such as <h1> and <p> tags take the entire width of the document.

Inline elements such as <b> and <em>,<i>,<img> element will take just enough space within a block

HTML 5 Block and Semantics elements
HTML 5 Block and Inline elements

HTML 5 Semantic Element

There is no concept of document design in HTML. There is not structural meaning to the HTML elements.
Hence, Introducing HTML 5 semantic web elements and here is the list.


Each of these tags can define the content they hold.

JavaScript Data Types

JavaScript variables are container for values and can hold different types of data. Re-declaration is allowed, except in ECMAScript such as ES5, ES6 and so on. To declare a variable use following syntax:

var total = 234.80;

Now , we will check different types of variables.

//simple integer
Var num = 34;
// floating point number
var secondNumber = 34.666;
var name = “ Peter Pan”;
You can use single quotes
var firstName = ‘John’;

When using a single quote or double quotes to enclose a string. Sometimes you need to use a single or double quote in the middle of the string. Use escape character (\”) or (\’).

var result = “ You’ve Passed”; 
/*here not need to use escape character because double quote can enclose a single quote or single quote can enclose a double. Make sure inner quote is different from outer.*/
var arr = [34, ‘tim’, true, 33.77];

Array can contain different types of values. The array index starts with 0.

//Will print the first element in the array.
//JavaScript Objects
//The JavaScript supports multiple type in the form of //key value pair.
//To declare a JavaScript object.
var car = {
“Model No”: “Hundai”,
“price”: 2000,

To access an object property.

  1. Use dot notation ex. Console.log(car.Price);
  2. Use bracket notation ex. Console.log(car[[‘Model No’];
// store the property in a variable
 var res = “Model No”;

JavaScript Operators

Arithmetic OperatorsDescription
JavaScript Arithmetic Operators

Comparison Operators

Logical and
Comparison Operators
>greater than
<less than
>=greater than or equal to
<=less than or equal to
!=not equal to
!==strict not equal to
==equal to
===strict equal to
||logical or
&&logical and
!logical not
Logical operators

How to Check Data Type in JavaScript?

To check the data type of any data element use the typeof keyword.

var roll = 4455;
console.log (typeof roll);
//returns number

What will happen if combine number and string type?

console.log (“Str” + 44) ;
// output Str44
console.log(44 + 20 + “STR”);
//output 64STR

//output 64STR because JavaScript thinks that it a number and adds two number and when string comes.
Everything is converted to string. JavaScript accept the latest type available.

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