Html

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HTML (v22.0004)
By:jyothish

Introduction to Hypertext
 HTML: Hypertext Markup Language
 Hypertext …
 links within and among Web documents
 connect one document to another
 Although this seems rather mundane today, this is a radical
departure from the structure of books since the invention of the
printing press

Origins of HTML
 HTML is based on SGML (Standardized General Markup
Language)
 “A philosophical rule was that HTML should convey the
structure of a hypertext document, but not the details of its
presentation.”
 Since then, HTML has evolved into a presentation language.

What is HTML?
• HTML (Hypertext Markup Language)
• HTML standards are developed under the authority of the World
Wide Web Consortium (W3C), headed by Tim Lee
• http://www.w3c.org
• HTML is the set of "markup" symbols or codes inserted in a file
intended for display on a World Wide Web browser.
• The markup tells the Web browser how to display a Web page's text,
images, sound and video files for the user.
• The individual markup codes are referred to as elements (but many
people also refer to them as tags).

HTML
 HTML is easy to pick up.
 There are many good books as well as resources on-line
 Our goal is to teach you the basics so that you can pick up the rest
on your own.

HTML Documents
• HTML documents are text documents
• We use simple ASCII text files
• Html file extensions: .html or .htm
• You can create html documents using:
• Notepad in Windows and TextEdit (MAC OS X)
• You can also use HTML Editors

HTML Editors
• HTML editors are called “WYSIWYG”
• What You See Is What You Get!
• Examples of HTML Editors:
• Dreamweaver
• Front Page
• Go Live

HTML Editors:
• Pros
• Good for beginners
• You do not have to know
much HTML to use editors
• It is easy to create complex
tables, image maps, and use
advanced functions such
as Style Sheets and JavaScript
• Easy for design due to the
WYSIWYG interface
• Cons
• They do not always
generate clean HTML
• Add redundant tags
• Add their own tags
• They do not offer good
graphic tools to
manipulate images
• It can be hard to fix HTML
tags since every time you
open a document, code is
added.

HTML Document Structure
•HTML Document contains
• Text (content of the page)
• HTML uses the following file extensions or suffix: .HTML or .HTM
• Embedded tags:
• provides instruction for the structure, and appearance of the content

HTML Document Structure
• The HTML document is divided into two major parts:
• HEAD: contains information about the document:
• Title of the page (which appears at the top of the browser window)
• Meta tags: used to describe the content (used by Search engines)
• JavaScript and Style sheets generally require statements in the
document Head
• BODY: Contains the actual content of the document
• This is the part that will be displayed in the browser window

Sample HTML Document
<HTML>
<HEAD>
<TITLE> My web page </TITLE>
</HEAD>
<BODY>
Content of the document
</BODY>
</HTML>

HTML Tags
• All HTML tags are made up of a tag name and sometimes
they are followed by an optional list of attributes which all
appear between angle brackets < >
• Nothing within the brackets will be displayed by the browser (unless
the HTML is incorrectly written and the browser interprets the tags as
part of the content)
• Attributes are properties that extend or refine the tag’s functions

Basic Syntax
Most (but not all!) HTML tags have a start tag
and an end tag:
<H1>Hello, world!</H1>
Basic Document Structure
header: information about the page, e.g.
the title.
body: the actual content of the page.
 document starts with
 <HTML> and ends with </HTML>

HTML Tags
• Standalone tags
• There are a few HTML tags which do not use an end tag and are
used for standalone elements on the page:
<img> to display an image
<BR> Line break
<HR> header

HTML Tags
• Attributes
<body bgcolor=“khaki” text=“#000000” link=“blue” vlink=“brown”
alink=“black” >
• Attributes are added within a tag to extend a tag’s action.
• You can add multiple attributes within a single tag.
• Attributes belong after the tag name; each attribute should be separated by
one or more spaces.
• Most attributes take values, which follow an equal sign “=“
• after the attribute’s name.
• Values are limited to 1024 characters in length.

This is Information which the browser
will ignore:
• Tabs
• multiple spaces will appear as a single space
• Example:
•
“Hello,
How are you?”
The browser will ignore the blanks and new
line:
Hello, How are you?

<P> v. <BR> Tags
 <BR>: Break
 <P>: Paragraph tag. Creates more space than a BR tag.
 <HR>: Creates a Horizontal Rule

Paragraph Tag <P>
• Leaves one empty line after the tag
• Multiple <P> tags with no intervening text is interpreted as
redundant by all browsers and will display a single <P> tag

Line break <BR>
• This tag breaks the line and starts text at a new line.
• It will not add an empty line like the paragraph tag
• Multiple <br> tags will display multiple line breaks

Using blockquotes
• Use <blockquote> …. </blockquote> to set up a “block”
of text. Nested blockquotes will further indent.
• For example:
<blockquote>Tiffany was one of America's most acclaimed and multitalented artists
working in the late 19th and early 20th centuries.
<blockquote>Of all of Tiffany's artistic endeavors, stained glass brought him the
greatest recognition. </blockquote></blockquote>
… will display as:
Tiffany was one of America's most acclaimed and multitalented artists
working in the late 19th and early 20th centuries.
Of all of Tiffany's artistic endeavors, stained glass brought him the greatest
recognition.

Comments 
• Browser will NOT display text in between


• I. E. uses the following tag as a comment:
<comment> this a comment </comment>

Headings: <h1> .. <h6>
• You can create Headlines of various sizes on your
page
• Headlines appear as bold letters
• An empty line will also follow the headlines.
• Used for titles
• H1 is the largest font and h6 is the smallest heading
• Headings need an end tag </h1>

Font Tags to specify color,
font type and size
<FONT FACE=ARIAL SIZE=6>
<B>The Curse of Xanadu</B>
</FONT>
<FONT FACE=ARIAL SIZE=3>
by By Gary Wolf, <I>Wired Magazine</I>
</FONT>
 Font tags:
 face: Arial, Courier, etc.
 size: e.g. 3, 6
 color: e.g. “RED”, “GREEN”, etc.

Text format tags
• Bold: <b> some text </b> or <strong>
• Italic <I> some text </I> or <em>
• <HR> (Horizontal Rule) Displays horizontal line in the browser
window. The line fills the window from left to the right margins. It’s
useful to separate sections of your document
• You can use attributes with <hr> such as
• <hr width=“70%”>

Lists
• Lists are used to organize items in the browser window:
• Unordered list: Bulleted list (most popular), list items with no
particular order
• Ordered list: Numbered list

Lists
 HTML supports two types of Lists:
 Ordered Lists (OL): e.g. 1,2,3
 UnOrdered Lists (UL): e.g. bullets.
 Basic Syntax:
<UL>
<LI>Item 1
<LI>Item 2
</UL>

Unordered list:
• Unordered list: Bulleted list
(most popular), lists items with
no particular order
Fruit
<UL>
<LI> Banana
<LI>Grape
</UL>
Fruit
• Banana
•Grape

Ordered list:
• Numbered list:
Fruit
<ol>
<LI> Banana
<LI>Grape
</OL>
Fruit
1. Banana
2. Grape

Hyperlinks (Anchor Tag):
• Hyperlinks are used for linking:
• within the same page (Named tags)
• To another page in your web site (Relative Link or local link)
• To another page outside your web site (Absolute or remote
link)
• Email Link
• Hyper Links: are highlighted and underlined text.
When you click on it, it takes you to another page
on the web.
<A command=“target”>highlighted text</A>

Hyperlinks:
• Absolute Link: These are links to another page
outside of your web site. These links specify the
entire URL of the page:
<A HREF=“http://www.nyu.edu/”>NYU Web Site</A>
NYU Web Site

Hyperlinks:
• Relative Link: These are links to another page in your site so
you do not have to specify the entire URL.
<A HREF=“index.html”>Go back to main page</A>
Go back to main page

Targeted Links
 A tag includes a target attribute. If you specify
target=“_blank”, a new browser window will be opened.
 <A HREF=“http://www.nyu.edu”
target="_blank”> NYU</A>
 More on this when we get to frames...

Email Link:
• You can someone at:
<a href=“mailto:jj1@nyu.edu”>Send email to
J.J.</A>

HTML Tables
 Tables represent a simple mechanism for
creating rows and columns of data.
 This is a great tool for laying out the content
of any web page, especially when you omit
the border by using:
 … border = “0” …
 Tables are very widely used and supported
by all common browsers.
 Tables use a very simple tag structure.

Backgrounds
• Use < body bgcolor = “ …” > for a background color with a hex
version of a web-safe color:
<body bgcolor = “ccffff”>
• For a tiled background using an image file:
<BODY background="backgroundPicture.gif">

HTML - Tables
• Tables tags starts with
1. <TABLE> tag, then
1. <TR> defines table rows.
• Each <TR> represents one row in the table.
• The number of rows is determined by the number of <TR>
1. <TD> Table data or <TH> Table Header can follow the <TR> tag
• The number of cells in each row is determined by the number of <TH> (Table
Header) and/or <TD> (Table data) tags contained within that row.
• <TH> text will be in bold, and centered
1. <table>
</table>
<tr> <td> cell 1 <th> cell 2 <th> cell 3 </tr>
<tr> <td> cell 4 <td> cell 5 <td> cell 6 </tr>
<tr> <td> cell 7 <td> cell 8 <td> cell 9 </tr>

Basic Tag Structure
<TABLE>
<TR >
<TH>Ticker</TH>
<TH>Price</TH>
</TR>
<TR>
<TD>MSFT</TD>
<TD>71 1/16</TD>
</TR>
<TR>
<TD>KO</TD>
<TD>46 15/16</TD>
</TR>
</TABLE>
TR: Table Row
TH: Table Heading
TD: Table Data
Every <TD> must have a matching
</TD>.
Every <TR> must have
a matching </TR>.

Table Attributes
<TABLE ALIGN=“left" BORDER=0 BGCOLOR=“cyan“ width=600 cellpadding=0 cellspacing=0>
• Align: "left", "center" or "right“ - "left" is the default
• Border: thickness of the border in pixels - 0 for no borders
• Bgcolor: is background color in HEX or as a name color
• Background=url (works with IE only)
• Cellpading=n (n is number of pixels (space) between cell content and its border
• Cellspacing=n (n is number of pixels (space) between cells)
• Height=n (height of table in pixels or percentages 100%)
• Width=n (Width of table in pixels or percentages 100%)

Scrolling text using the
<marquee> tag
<html>
<head><title> scrolling text</title></head>
<marquee><font face=”sand">Welcome to my
website! Be sure to visit again!</marquee>
</body>
</html>

Images
<img src= "logoblue.gif" width="153"
height="31" border="0" alt="W I R E D">
 Image Attributes
 src: URL or filename for the image
 width/height: not required
 border: not required.
 alt: recommended for users running a text browser.

Adding multimedia files
• <a href=“filename.extension> listen to sound file </a>
• <a href=“sound1.wav> listen to sound file </a>
• <a href=“movie1.mov> view movie clip </a>

File Type Extention/Mime type
================================
plain text: .txt
HTML document: .html
GIF image: .gif or .jpg or .png
Acrobat file: .pdf
AIFF sound file: .aiff .au . wav
MP3 .mp3
QuickTime movie: .mov
MPEG movie: .mpeg or .mpg
Multimedia FiletypesMultimedia Filetypes

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