Basic Html Knowledge for students

What is HTML?
 HTML is short for "Hyper Text Markup Language".
 It simply means it is a language for describing web-pages using
ordinary text.
 All HTML documents must start with a type declaration: <!DOCTYPE
html>.
 The HTML document itself begins with <html> and ends with </html>.
 The visible part of the HTML document is
between <body> and </body>.

• Every web page is actually a HTML file.
• Each HTML file is just a plain-text file, but with
a .html file extension instead of .txt, and is made up of
many HTML tags as well as the content for a web
page.
A web site will often contain many html files that link to
each other. You can edit HTML files with your
favorite editor. Like Adobe Dreamweaver, Microsoft
Expression Web, Coffee Cup HTML Editor
HTML Files

HTML Tags
 HTML tags are the hidden keywords within a web page that define how the
browser must format and display the content.
 Most tags must have two parts, an opening and a closing part.
 For example, <html> is the opening tag and </html> is the closing tag. Note that
the closing tag has the same text as the opening tag, but has an additional
forward-slash ( / ) character.
 The purpose of a web browser (Chrome, IE, Firefox, Safari) is to read HTML
documents and display them.
 The browser does not display the HTML tags, but uses them to determine how to
display the document:

 The DOCTYPE declaration defines the document type to be HTML
 The text between <html> and </html> describes an HTML
document
 The text between <head> and </head> provides information about
the document
 The text between <title> and </title> provides a title for the
document
 The text between <body> and </body> describes the visible page
content
 The text between <h1> and </h1> describes a heading
 The text between <p> and </p> describes a paragraph

HTML Elements
• An HTML element is defined by a starting tag. If the element
contains other content, it ends with a closing tag, where the
element name is preceded by a forward slash as shown below
with few tags:
Start Tag Content End Tag
<p> This is paragraph content. </p>
<h1> This is heading content. </h1>
<div> This is division content. </div>
<br />

• Here <p>....</p> is an HTML element, <h1>...</h1> is another HTML
element.
• There are some HTML elements which don't need to be closed, such as
<img.../>, <hr /> and <br /> elements.
• These are known as void elements.
• HTML documents consist of a tree of these elements and they specify
how HTML documents should be built, and what kind of content should
be placed in what part of an HTML document.
• An HTML element is defined by a starting tag. If the element contains
other content, it ends with a closing tag.
• For example <p> is starting tag of a paragraph and </p> is closing tag of
the same paragraph but <p>This is paragraph</p> is a paragraph
element

HTML Attributes
 An attribute is used to define the characteristics of an HTML element and is
placed inside the element's opening tag. All attributes are made up of two parts:
a name and a value.
 The name is the property you want to set. For example, the paragraph <p>
element in the example carries an attribute whose name is align, which you can
use to indicate the alignment of paragraph on the page.
 The value is what you want the value of the property to be set and always put
within quotations. The below example shows three possible values of align
attribute: left, center and right.

Core Attributes
The four core attributes that can be used on the majority of HTML elements are:
 Id
 Title
 Class
 style

The id Attribute
 The id attribute of an HTML tag can be used to uniquely identify any element
within an HTML page. There are two primary reasons that you might want to
use an id attribute on an element:
 If an element carries an id attribute as a unique identifier it is possible to
identify just that element and its content.
 If you have two elements of the same name within a Web page (or style
sheet), you can use the id attribute to distinguish between elements that have
the same name.
 Example:
<p id="html">This para explains what is HTML</p>
<p id="css">This para explains what is Cascading Style Sheet</p>

The title Attribute
• The title attribute gives a suggested title for the element. They syntax for
the title attribute is similar as explained for id attribute:
• Example
<!DOCTYPE html>
<html>
<head>
<title>The title Attribute Example</title>
</head>
<body>
<h3 title="Hello HTML!">Titled Heading Tag Example</h3>
</body>
</html>

The class Attribute
• The class attribute is used to associate an element with a style
sheet, and specifies the class of element.
• Example:
class="className1 className2 className3"

The style Attribute
• The style attribute allows you to specify Casecading Style Sheet (CSS) rules
within the element.
• Example:
<!DOCTYPE html>
<html>
<head>
<title>The style Attribute</title>
</head>
<body>
<p style="font-family:arial; color:#FF0000;">Some text...</p>
</body>
</html>

HTML Headings
• Headings are defined with the <h1> to <h6> tags.
• <h1> defines the most important heading. <h6> defines the least important
heading.
Example:
<!DOCTYPE html>
<html>
<body>
<h1>This is heading 1</h1>
</body>
</html>

<hr> tag
 The <hr> tag creates a horizontal line in an HTML page.
 The hr element can be used to separate content:
 Example:
<!DOCTYPE html>
<html>
<body>
<p>The hr tag defines a horizontal rule:</p>
<hr>
<p>This is a paragraph.</p>
<hr>
<hr>
</body>
</html>

HTML Paragraphs
• <p> </p> element
• The HTML <p> element defines a paragraph.
• In HTML You cannot be sure how HTML will be displayed.
• Large or small screens, and resized windows will create different results.
• With HTML, you cannot change the output by adding extra spaces or extra lines
in your HTML code.
• The browser will remove extra spaces and extra lines when the page is
displayed.
• Any number of spaces, and any number of new lines, count as only one
space.

Example:
<!DOCTYPE html>
<html>
<body>
<p>
This paragraph
contains a lot
of lines.
it also contains lots
of space.
</p>
</body>
</html>

• <br> element
• The HTML <br> element defines a line break.
• Use <br> if you want a line break (a new line) without starting a new paragraph
• The <br> element is an empty HTML element. It has no end tag.
• Example :
<!DOCTYPE html>
<html>
<body>
<p>This is<br>a para<br>graph with<br> line breaks</p>
</body>
</html>

• <pre> element
• The HTML <pre> element defines preformatted text.
• The text inside a <pre> element is displayed in a fixed-width font.
• It is used for poem writing.
• Example:
<!DOCTYPE html>
<html>
<body>
<p>The pre tag preserves both spaces and line breaks:</p>
<pre>
My Bonnie lies over the ocean.
My Bonnie lies over the sea.
My Bonnie lies over the ocean.
Oh, bring back my Bonnie to me.
</pre>
</body>
</html>

HTML Styles
• Every HTML element has a default style (background color is white and text
color is black).
• Changing the default style of an HTML element, can be done with the style
attribute.
• The HTML style attribute has the following syntax:
style="property:value“
• Example:
<!DOCTYPE html>
<html><body>
<h2 style="color:red">I am Red</h2>
<h2 style="color:blue">I am Blue</h2>
</body> </html>

Change Background color:
Example:
<!DOCTYPE html>
<html>
<body style="background-color:pink">
<h1>This is a heading</h1>
</body>
</html>

Change Text Color
Example :
<!DOCTYPE html>
<html>
<body>
<h1 style="color:blue">This is a heading</h1>
<p style="color:red">This is a paragraph.</p>
</body>
</html>

Change font-family
Example:
<!DOCTYPE html>
<html>
<body>
<h1 style="font-family:verdana">
This is h1 a heading</h1>
<h2 style="font-family:courier">
This is h2 a heading</h2>
</body>
</html>

Change Text Size
Example:
<!DOCTYPE html>
<html>
<body>
<h1 style="font-size:300%">
This is a heading
</h1>
<p style="font-size:160%">
This is a paragraph
.</p>
</body>
</html>

Change Text Alignment
Example:
<!DOCTYPE html>
<html>
<body>
<h1 style="text-align:center"> Centered heading </h1>
<h1 style="text-align:left"> left heading </h1>
<h1 style="text-align:right"> right heading </h1>
</body> </html>

HTML Text Formatting Elements
<b> element or <strong>
• The HTML <b> and <strong> element defines bold text, without any extra
importance.
• Example
<!DOCTYPE html>
<html>
<body>
<p>This text is normal.</p>
<p><b>This text is bold.</b></p>
<p><strong>This text is strong.</strong></p>
</body> </html>

<i> or <em> element
• Both defines italic text, without any extra importance.
• Example
<!DOCTYPE html>
<html>
<body>
<p><em>This text is emphasized.</em></p>
<p>This text is normal.</p>
<p><i>This text is italic.</i></p>
</body>
</html>

<small> element
• The HTML <small> element defines small text:
• Example:
<!DOCTYPE html>
<html>
<body>
<h2>HTML <small>Small</small> Formatting</h2>
</body>
</html>

<mark> element
• The HTML <mark> element defines marked or highlighted text:
• Example
<!DOCTYPE html>
<html>
<body>
<h2>HTML <mark>Marked</mark> Formatting</h2>
</body>
</html>

<del> element
• The HTML <del> element defines deleted (removed) of text.
• Example :
<!DOCTYPE html>
<html>
<body>
<p>The del element represent deleted (removed) text.</p>
<p>My favorite color is <del>blue</del> red.</p>
</body>
</html>

<ins> element
• The HTML <ins> element defines inserted (added) text.
• Example:
<!DOCTYPE html>
<html>
<body>
<p>The ins element represent inserted (added) text.</p>
<p>My favorite <ins>color</ins> is red.</p>
</body>
</html>

<sub> element
• The HTML <sub> element defines subscripted text.
• Example:
<!DOCTYPE html>
<html>
<body>
<p>This is <sub>subscripted</sub> text.</p>
</body>
</html>

<sup> element
• The HTML <sup> element defines superscripted text.
• Example:
<!DOCTYPE html>
<html>
<body>
<p>This is <sup>superscripted</sup> text.</p>
</body>
</html>

HTML Quotation and Citation Elements
<q> element
• The HTML <q> element defines a short quotation.
• Example:
<!DOCTYPE html>
<html>
<body>
<p>Browsers insert quotation marks around the q element.</p>
<p>WWF's goal is to: <q>Build a future where people live in harmony with
nature.</q></p>
</body> </html>

<blockquote> element
• The HTML <blockquote> element defines a quoted section.
• Example:
<!DOCTYPE html>
<html> <body>
<p>Browsers usually indent blockquote elements.</p>
<blockquote>
For 50 years, WWF has been protecting the future of nature.
The world's leading conservation organization,
WWF works in 100 countries and is supported by
1.2 million members in the United States and
close to 5 million globally.
</blockquote>
</body> </html>

<abbr> element
• The HTML <abbr> element defines an abbreviation or an acronym.
• Example
<!DOCTYPE html>
<html>
<body>
<p>The <abbr title="World Health Organization">WHO</abbr> was founded in
1948.</p>
<p>Marking up abbreviations can give useful information to browsers, translation
systems and search-engines.</p>
</body>
</html>
When we put cursor on abbreviation its
full form appear

<address> element
• The HTML <address> element defines contact information (author/owner) of a
document or article.
• Example
<!DOCTYPE html>
<html>
<body>
<p>The HTML address
element defines
contact information
(author/owner)
of a document or
article.</p>
<address>
Written by Jon Doe.<br>
Visit us at:<br>
Example.com<br>
Box 564, Disneyland<br>
USA
</address>
</body>
</html>

<bdo> element
• The HTML <bdo> element defines bi-directional override.
• If your browser supports bdo, this text will be written from right to left:
• Example
<!DOCTYPE html>
<html>
<body>
<p>If your browser supports bi-directional override (bdo), the next line will be written
from right to left (rtl):</p>
<bdo dir="rtl">This line will be written from right to left</bdo>
</body>
</html>

HTML Styles - CSS
 CSS stands for Cascading Style Sheets
 Styling can be added to HTML elements in 3 ways:
1. Inline - using a style attribute in HTML elements
2. Internal - using a <style> element in the HTML <head> section
3. External - using one or more external CSS files
 The most common way to add styling, is to keep the styles in separate CSS
files.
 SS styling has the following syntax:
element { property:value; property:value }
 The element is an HTML element name. The property is a CSS property.
The value is a CSS value.

Inline Styling (Inline CSS)
• Inline styling is useful for applying a unique style to a single HTML element
• Inline styling uses the style attribute.
• Example
<!DOCTYPE html>
<html>
<body>
<h1 style="color:blue">
This is a Blue Heading
</h1>
</body>
</html>

Internal Styling (Internal CSS)
• An internal style sheet can be used to define a common style for all HTML
elements on a page.
• Internal styling is defined in the <head> section of an HTML page, using
a <style> element
• Example:
<!DOCTYPE html>
<html>
<head>
<style>
body {background-color:pink}
h1 {color:blue}
p {color:darkgreen}
</style>
</head>
<body>
</body> </html>

External Styling (External CSS)
• External style sheet are ideal when the style is applied to many pages.
• With external style sheets, you can change the look of an entire web site by
changing one file.
• External styles are defined in an external CSS file, and then linked to in
the <head> section of an HTML page
• Example
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="styles.css">
</head>
<body>
</body>
</html>

CSS Fonts
• The CSS color property defines the text color to be used for the HTML element.
• The CSS font-family property defines the font to be used for the HTML element.
• The CSS font-size property defines the text size to be used for the HTML
element.
• Example:
<!DOCTYPE html>
<html>
<head> <style> h1 {color:blue; font-family:verdana; font-size:300%;}
p {color:red; font-family:courier; font-size:160%;} </style>
</head>
<body> <h1>This is a heading</h1> <p>This is a paragraph.</p>
</body> </html>

The CSS Box Model
1. Border:
• Every HTML element has a box around it, even if you cannot see it.
• The CSS border property defines a visible border around an HTML element:
• Example
<!DOCTYPE html>
<html>
<head> <style> p {border:1px solid red;} </style> </head>
<body>
<h1>This is a heading</h1> <p>This is a paragraph.</p>
</body>
</html>

2. Padding
• The CSS padding property defines a padding (space) inside the border.
• Example
<!DOCTYPE html>
<html>
<head>
<style> p {border:3px solid red;padding:10px;} </style>
</head>
<body>
</body>
</html>

3. Margin
• The CSS margin property defines a margin (space) outside the border:
• Example
<!DOCTYPE html>
<html><head>
<style>p { border:1px solid red; padding:5px;margin:60px;}
</style></head>
<body>
<h1>This is a heading</h1><p>This is a paragraph.</p>
</body></html>

4. The id Attribute
• All the examples above use CSS to style HTML elements in a general way.
• To define a special style for one special element, first add an id attribute to the
element
• Example
<!DOCTYPE html>
<html>
<head>
<style>
p#p01 {color: blue;}
</style>
</head>
<body>
<p id="p01">I am different.</p>
</body>
</html>

5. The class Attribute
• To define a style for a special type (class) of elements, add a class attribute to
the element
• Example
<!DOCTYPE html>
<html>
<head>
<style>
p.error {color:red;}
</style>
</head>
<body>
<p class="error">I am different.</p>
<p class="error">I am different too.</p>
</body>
</html>

HTML Links
• HTML links are hyperlinks.
• A hyperlink is a text or an image you can click on, and jump to another
document.
• In HTML, links are defined with the <a> tag
• HTML link syntax is <a href="url"> link text </a>
• The href attribute specifies the destination address (http://www.vethics.com)
• The link text is the visible part (Visit our HTML tutorial).
• Clicking on the link text, will send you to the specified address.

Example :
<!DOCTYPE html>
<html>
<body>
<p>
<a href="http://www.vethics.com">
Visit our website
</a>
</p>
</body>
</html>
By clicking on
link the site
will open

HTML Images
• In HTML, images are defined with the <img> tag.
• The <img> tag is empty, it contains attributes only, and does not have a closing
tag.
• The src attribute defines the url (web address) of the image
• The alt attribute specifies an alternate text for the image, if it cannot be
displayed.
• Its syntax is <img src="url" alt="some_text">
• You can use the style attribute to specify the width and height of an image.

Example
<!DOCTYPE html>
<html>
<body>
<img src="html5.gif" alt="HTML5 Icon"
style="width:150px;height:128px">
</body>
</html>

HTML Lists
Unordered HTML Lists
• An unordered list starts with the <ul> tag.
• Each list item starts with the <li> tag.
• The list items will be marked with bullets (small black circles).
• Examples
<!DOCTYPE html>
<html>
<body>
<h2>
Unordered List with Default Bullets
</h2>
<ul>
<li>Coffee</li>
<li>Tea</li>
<li>Milk</li>
</ul>
</body>
</html>

Style Description
list-style-type:disc The list items will be marked with bullets
(default)
list-style-type:circle The list items will be marked with circles
list-style-type:square The list items will be marked with squares
list-style-type:none The list items will not be marked

Ordered HTML Lists
• An ordered list starts with the <ol> tag.
• Each list item starts with the <li> tag.
• The list items will be marked with numbers.
• Example
<!DOCTYPE html>
<html>
<body>
<h2>Ordered List</h2>
<ol>
<li>Coffee</li>
<li>Tea</li>
<li>Milk</li>
</ol>
</body>
</html>

Type Description
type="1" The list items will be numbered with numbers (default)
type="A" The list items will be numbered with uppercase letters
type="a" The list items will be numbered with lowercase letters
type="I" The list items will be numbered with uppercase roman
numbers
type="i" The list items will be numbered with lowercase roman
numbers

HTML Description Lists
• A description list, is a list of terms, with a description of each term.
• The <dl> tag defines a description list.
• The <dt> tag defines the term (name), and the <dd> tag defines the data
(description).
• Example
<!DOCTYPE html>
<html>
<body>
<h2>A Description List</h2>
<dl>
<dt>Coffee</dt>
<dd>- black hot drink</dd>
<dt>Milk</dt>
<dd>- white cold drink</dd>
</dl>
</body>
</html>

HTML Tables
• Tables are defined with the <table> tag.
• Tables are divided into table rows with the <tr> tag.
• Table rows are divided into table data with the <td> tag.
• A table row can also be divided into table headings with the <th> tag.
• If you do not specify a border for the table, it will be displayed without borders.
• A border can be added using the border attribute

Example
<!DOCTYPE html>
<html>
<body> <table border="1" style="width:100%">
<tr> <td>Jill</td> <td>Smith</td> <td>50</td> </tr>
<tr> <td>Eve</td> <td>Jackson</td> <td>94</td> </tr>
<tr> <td>John</td> <td>Doe</td> <td>80</td> </tr>
</table>
</body>
</html>

Basic Html Knowledge for students

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