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Cours HTML complet en Anglais

Cours HTML complet en Anglais
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HTML Crash Course

By Daniel D'Agostino

2nd June 2007

Revised 19th June 2007

HTML Kickstart: Tools Needed

A text editor

*    Notepad is fine

*    Chami's HTML-Kit is better

*    Other systems can use their respective text editors

A web browser, preferably two

*    Firefox

*    Internet Explorer

Some good reference

*   

HTML Kickstart: HTML Demo

*    HTML is just text

*    HTML tags give text a special meaning

*    Create a new text file* Name it (htm = html) * Write the following in the file:

“The <b>future</b> <u>is</u> <i>now</i>.”

*    Now open the file with a web browser.

*    What happened to the text enclosed in tags?

HTML Kickstart: HTML Syntax

*    HTML tags normally have a start tag

   (<b>) and a closing tag (</b>) * You can have multiple tags around the    same text but they must be closed in    reverse order

<b><i>Hello!</i></b>

*    Tags are sometimes called elements

HTML Text Formatting: Spacing

White space

*    newlines

*    multiple spaces

Spacing tags

*    <br>

*    <p>

*    <br> is called an empty tag

*    Block and inline elements

HTML Text Formatting: <font>

*    The <font> tag is deprecated

*    Use it until you learn better things* HTML tags can have attributes * <font> attributes:

*    face

*    color

*    size

*    Order of attributes not important

*    Values in quotes

HTML Text Formatting: Headings

*    <h1> through <h6>

*    Hierarchal structure (use <h1> for page   title, etc)

*    Headings may be customised (like all   other text)

<h2><font color=”blue”><u>Heading 1</u></font></h2>

<h2><font color=”blue”><u>Heading 2</u></font></h2>

<h2><font color=”blue”><u>Heading 3</u></font></h2>

Why Layout Tags are Bad

*    Previous example has lots of extra layout   code

*    A lot of layout code is repeated several   times

*    It adds nothing to the meaning of the text

   (the heading is still a heading) * Ideally content and presentation should    be separate

*    This is achieved with CSS (another   language)... for now live with HTML

Logical Tags vs Layout Tags

*    <font> is very bad

*    <b>, <i> and <u> are bad as well* <strong> and <em> should be used    instead of <b> and <i>

*    <u> should not be used because text can   be confused with links

*    <strong> means text should stand out

*    <em> means text should be emphasised* <b> and <i> just mean the text should look different (no meaning)

*    example of JAWS browser reading text

*    <em>not</em> or <strong>not</strong>?

HTML Text Formatting: Quotations

The <blockquote> tag

*    needs inner tags (e.g. <p>)

*    block element

The <q> tag

*    inline element

*    browser incompatibilities

HTML Comments

<!-- comment -->

Useless in HTML

*    demonstrate using <blockquote>

*    HTML tags are clear and legible * HTML comments increase the size of     the page, unlike with programming

HTML Text Formatting: Code

Tags used to format source code in a

page

*  <code> (inline, monospace)

*  <var> (inline, not monospace) * <pre> (block, monospace, kills     whitespace)

HTML Text Formatting: Other

<p> can be aligned left, right, center or justify (left is usually best)

Serif fonts are best for printed media; sans-serif are best for reading off a screen

Horizontal rules (<hr>): another empty tag More (less useful) text formatting tags:

HTML Entities

*     You cannot use < or > characters   because they are used for HTML tags * Entities are used where special characters    are needed

*     Examples: &lt; &gt; &copy; &nbsp; &amp; &quot;* Entity formats: name and number * Reference:

HTML Links

*    Link is the most important thing

*    Format: <a href=””>link</a>* Links are relative unless they start with    a protocol (e.g. http:// or file://)

*    <a href=””>google</a>

   - wrong! (relative)

*    For internal links, relative links are better

*    shorter

*    transparent when relocating website

Relative Links: Folder Navigation

*    / - root

*    .. - parent directory* . - current directory

*    dir/ - child directory named 'dir'

*    ../dir1/ - 'dir1' directory in parent directory

Append slash to domains/folders to prevent multiple requests

HTML Links: Local Links

*    Used to link to a specific point in a page

*    <a href=”#label”>local link</a>

*    <a name=”label”>local anchor</a> (old)

*    <h2 id=”label”>local anchor</h2> (best)

*    Example of simple table of contents

Links to other media

mailto: links

*    try mailto: in browser

*    mailto: link

*    additional parameters

*    make it VERY clear that mail client will pop up

Other file types (zip, pdf, doc, etc)

*    Linking to any file type is possible, not just htm

*    make it clear that link does not go to a webpage    * it is very annoying to have a pdf load when a        webpage is expected     * put a little icon or something

Notes about links

When you link to a folder, it will fetch index.*, so is generally the first file you should create

Link text should be descriptive (e.g. “Photos of my garden”) to show where they go

Link text should not be an action (e.g. “Click here!”)

*    link destination is not clear

*    people don't like being told what to do

Use title attribute when a link cannot be clear

HTML Lists

*    Ordered Lists (<ol>, <li>)

*    Unordered Lists (<ul>, <li>)

*    When to use each

*    Definition Lists (<dl>, <dt>, <dd>)

*    Nested Lists

HTML Images

*    Images are separate files (compare doc   with htm)

*    <img src=”” alt=”Picture”>* ALT is not there to popup text, even though Internet Explorer does it * ALT = alternate text, used if the image fails to load

*    Use title attribute to popup text

Other attributes: width, height, border, title, align, hspace, vspace

HTML Images: Advice

Use only jpg, gif and png formats

*    bitmaps are too large

*    other formats are not always readable

Specify a width and a height for the image to make sure page doesn't keep resizing every time an image loads

Thumbnailing

*    To make a thumbnail, enclose an image in a link

<a href=””>

  <img src=”” alt=””> </a>

*    It is possible to use the same picture and  resize it using width and height attributes * Very bad – wastes bandwidth!

Image Maps

This section is here for completeness' sake and can be skipped

*    image map => image with clickable areas

*    <map> tag, id attribute

*    <area> tag, attributes: alt, coords, href,   shape, title

*    shape can be rect, circle or polygon

HTML Tables

*    A table is made up of rows and columns

*    A table can be considered a list of rows

*    A row can be considered a list of cells

*    <table>: table

*    <tr>: table row

*    <td>: table data (cell)

*    <th>: table heading

HTML Tables: Example

<table>

 <tr>

  <td>Row 1 Cell 1</td>

  <td>Row 1 Cell 2</td>

 </tr>

 <tr>

  <td>Row 2 Cell 1</td>

  <td>Row 2 Cell 2</td>

 </tr>

</table>

HTML Tables: Attributes

*    cellpadding and cellspacing (difference   between padding and margin) * colspan and rowspan (merging cells)

*    summary

*    usual width, height, border, background,   bgcolor

Basic Page Layout with Tables

Page Title

Navigation

Content

Why Tables are Not So Good

*  They still bloat the page with presentation   information

*  They defeat the purpose of having a   logical relationship between rows and    columns

Item

Price

A

$4.99

B

$3.50

C

$8.99

D

$1.00

*  They are still better than frames (next)

HTML Frames

*    Why frames are/were used

*    Navigation in one file

*    Why frames are bad

*    No logical page structure

*    Printing problems (old)

*    Browser compatibility (old)

*    Search engine difficulties

*    If a search engine does find a page,       that page is isolated

*    Address bar does not tell you where you are

Frames (continued)

*    Why frames are bad (continued)

*    Cannot view source

*    Bookmarking/deep-linking

*    Why there is no excuse to use frames    * Now there are languages (e.g. PHP) for

server-side page inclusion

*    Targeting links

*    target attribute: _top, _blank    * not recommended!

HTML Forms

*    Forms are a way of interacting with a   website (e.g. an application form) * Forms are useless until you know a    language capable of processing them    (e.g. PHP)

*    The <form> tag:

*    method (difference between get/post)

*    name/id

*    action

HTML Forms: <input>

<input> tag used for most inputs  * type: button, checkbox, file, hidden,

    image, password, radio, reset, submit,     text

*    importance of submit button

*    id attribute (to distinguish input fields)

*    value attribute (to set a default value)

HTML Forms: Other input tags

<textarea rows=”40” cols=”10” id=”message”>  hi

</textarea>

<select name=”day”>

 <option value=”1”>Monday</option>

 <option value=”2”>Tuesday</option>

 <option value=”3”>Wednesday</option>

 <option value=”4”>Thursday</option>

 <option value=”5”>Friday</option>

 <option value=”6”>Saturday</option>

 <option value=”7”>Sunday</option>

</select>

<fieldset>

Creates a border around some elements, good for distinguishing a form or parts of a form

<fieldset>

  <legend>Caption!</legend>

  <p>Other stuff...</p>

</fieldset>

Meaning of HTML

Now that you know HTML, you can understand what it stands for.

HTML = Hypertext Markup Language

Hypertext is about links.

A markup language differs from a programming language in that it is text-based and uses tags to 'mark up' text.

History of HTML: <font>

*    Once upon a time there was HTML 3.2

*    HTML 3.2 introduced the <font> tag* This allowed webmasters to handle both presentation and content using HTML

*    It made a mess

*    HTML 4 was later introduced, along with   CSS. HTML handles page structure, while CSS handles layout.

*    The latest standard in pure HTML is

   HTML 4.01

   The latest HTML standard is XHTML 1.1

*    HTML 5 and XHTML 2 are being developed

History of HTML: The Browser Wars

*    Once upon a time there were no   standards for HTML

*    Microsoft Internet Explorer and Netscape   Navigator were the top browsers at the time, so they decided which HTML tags    to create

*    They made a mess

*    Each one started inventing its own tags,   e.g. Microsoft invented <marquee> and    Netscape invented <blink>, both of which    are very annoying

History of HTML: W3C

*    A body was needed to set standards* The World Wide Web Consortium (W3C)    was created

*    The W3C is directed by the inventor of   the World Wide Web, Tim Berners-Lee * Tim Berners-Lee was knighted in July 2004 * The W3C sets standards of HTML and    many other web technologies

*    The W3C also maintains an HTML validator:

*    Your HTML will not validate as it is!

HTML Document Structure

*    You can't just throw your tags around

   the page blindly

*    There is a document structure that must   be adhered to

*    Each HTML document consists of a head   and a body

*    All your content goes in the body* The head section contains information    about the page

HTML Document Structure Example

<html>

<head>

 <title>My page</title>

 <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">

</head>

<body>

<!-- page content -->

</body>

</html>

Head Section Explained

*    <title> is the browser title

*    <meta> tags are metadata, i.e. data   about data, i.e. information about the page * <meta> tags can include keywords, author,    description, etc.

*    They are mostly useless but the one in the   example (which specifies the character    encoding of the page) is necessary for    validation

*    Don't try to remember the character   encoding meta tag by heart... just copy and    paste!

Document Type Definition

Before the <html> tag, we must place a Document Type Definition showing the HTML version and one of three document types:

*    Transitional – the validator is very lenient

*    Strict – recommended for good code

*    Frameset – used for frames (keep away)

The DTD is another of those things you copy and paste and don't remember by heart

DTDs for HTML 4.01

Taken from:

<!DOCTYPE HTML PUBLIC

"-//W3C//DTD HTML 4.01//EN"

"">

<!DOCTYPE HTML PUBLIC

"-//W3C//DTD HTML 4.01 Transitional//EN"

"">

<!DOCTYPE HTML PUBLIC

"-//W3C//DTD HTML 4.01 Frameset//EN"

"">

Validate your code

*     Put one of those DTDs (preferably the   strict one) at the beginning of your HTML    page, before the <html> tag * Try validating your page against the

   W3C Validator now

*     The Validator will complain if any HTML is   not well-formed

*     Don't worry if you see loads of errors...   errors tend to cascade so chances are    that fixing one line will solve about 20    errors

XHTML

XHTML is Extensible HTML

*    it is based on XML so it is stricter

*    it is among the latest HTML standards * some handheld devices (e.g. mobile    phones) can read XHTML webpages  * it is a good way to get used to writing    good code

HTML to XHTML

*    All tags must be closed, even if they are  empty tags

*    <br> becomes <br />

*    All tags and attributes must be lowercase

*    <strong> not <STRONG>

*    All tags must be closed in the right order

*    <b><i>wow</b></i> is wrong

*    Attribute values must be in quotes

*    <p align=”center”>text</p>

*    Use the id attribute instead of name

*    Use an XHTML DTD

XHTML 1.0 DTDs

Taken from:

<!DOCTYPE html

PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

"">

<!DOCTYPE html

PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"">

<!DOCTYPE html

PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"

"">

XHTML 1.1

*    XHTML 1.1 is a bit trickier

*    It is not just about adding a DTD* An XML version declaration is added at    the top before the DTD

*    This declaration also includes the   character encoding, so we no longer need    the meta tag

*    The <html> tag now also has some extra   attributes

*    Don't remember! Copy and paste!

XHTML 1.1 Strict Example

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"

"">

<html xmlns="; xml:lang="en">

<head>

...

Remember to omit the <meta> tag for character encoding!

Moving On

*    HTML on its own is very basic

*    The next language to learn is definitely CSS

*    After CSS, you can optionally learn JavaScript* Or you can go straight to a server-side language such as PHP

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