Introduction to XML, XHTML and CSS

Introduc)on
to
XHTML
and
CSS

Jussi
Pohjolainen

Tampere
University
of
Applied
Sciences

EXTENSIBLE
MARKUP
LANGUAGE

Extensible
Markup
Language

•  XML
is
a
speciﬁca)on
for
crea)ng
custom

markup
languages

•  Subset
of
SGML

•  XML
languages:
RSS,
MathML,
SVG,
XHTML

•  W3C
Recommenda)on

XML
and
SGML

SGML

XML

RSS
XHTML
SVG
HTML

XML
Example

<?xml version=“1.0” encoding=“utf-8”?>!
<books>!
!<book id=“A01”>!
!!<title>Designing Web Usability</title>!
!!<author>Jakob Nielsen</author>!
!</book>!
</books>!

XML
Well
Formed

•  XML
Declara)on

•  One
root-‐element

•  Every
tag
is
opened
and
ended

•  ASributes
inside
“
”

•  Case-‐sensi)vity

XML
Example

<?xml version=“1.0” encoding=“utf-8”?>!
<!DOCTYPE books SYSTEM “books.dtd”>!
<books>!
!<book id=“A01”>!
!!<title>Designing Web Usability</title>!
!!<author>Jakob Nielsen</author>!
!<book>!
</books>!

DTD
Example:
books.dtd

<!ELEMENT books (book+)>!
<!ELEMENT book (title, author)>!
<!ELEMENT title (#PCDATA)>!
<!ELEMENT author (#PCDATA)>!
<!ATTLIST book id ID #REQUIRED>!

XML
Valid

•  XML
document
is
valid,
when
it
follows
it’s
dtd

•  Valida)on
can
be
done
only,
if
the
xml

document
has
dtd
(or
schema)

•  XHTML
strict
1.0
dtd:

–  hSp://www.w3.org/TR/xhtml1/DTD/xhtml1-‐
strict.dtd

EXTENSIBLE
HYPERTEXT
MARKUP

LANGUAGE

XHTML

•  XHTML
is
a
XML
based
language

•  XHTML
1.0
/
1.1:

–  Strict

–  Transi)onal

–  Frameset

XHTML
Example

<?xml version="1.0"?>!
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"!
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">!
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
lang="en">!
<head>!
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8" />!
<title>XHTML 1.0 Example</title>!
</head>!
<body>!
<p>This is a example.</p>!
</body>!
</html>!

General
Form

•  XHTML
consists
of

–  Xml-‐declara)on

–  Document
type

–  XHTML
-‐
document

•  head

•  body

XHTML
Basic
Structure

•  Every
element
is
wriSen
in
lower
case

•  If
element
does
not
contain
anything,
it’s
empty
element:

–  <br></br>
<!–
line
break
-‐-‐>

–  <hr></hr>
<!–
horizontal
line
-‐-‐>

–  <img
src=”pic.jpg"
alt=”picture"></img>
<!-‐-‐
picture
-‐-‐>

•  Empty
elements
should
be
wriSen
like
this:

–  <br/>

–  <hr/>

–  <img
src=”pic.jpg"
alt=”picture"/>

Inden)ng

•  Indenta)on
is
free
in
xml

•  It’s
easier
to
read
the
document,
if
you
use
indenta)on

•  One
indenta)on:
4
spaces:

<ul>
____<li>Carrot</li>
____<li>Tomato</li>
</ul>

Commen)ng

•  It’s
possible
to
add
comments
to
xhtml
–

documents:

•  <!-‐-‐
and
here
we
have
a
list
-‐-‐>

Document
types

<!DOCTYPE
html
PUBLIC
"-‐//W3C//DTD
XHTML
1.0
Strict//EN"

"
hSp://www.w3.org/TR/xhtml1/DTD/xhtml1-‐strict.dtd">

<!DOCTYPE
html
PUBLIC
"-‐//W3C//DTD
XHTML
1.0
Transi)onal//EN"
"
hSp://www.w3.org/TR/xhtml1/DTD/xhtml1-‐transi)onal.dtd">a

<!DOCTYPE
html
PUBLIC
"-‐//W3C//DTD
XHTML
1.0
Frameset//EN"
"
hSp://www.w3.org/TR/xhtml1/DTD/xhtml1-‐frameset.dtd">

Head

•  Compulsary:
)tle

•  Meta-‐informa)on

–  See:

hSp://www.cs.tut.ﬁ/~jkorpela/webjulk/1.6.html

•  Possible
linking
to
stylesheets

Text
-‐
elements

•  p
•  S

•  br
•  i

•  blockquote
•  b

•  pre
•  big

•  em
•  small

•  strong
•  sub

•  code
•  sup

Lists

•  ul:
unordered
list

•  ol:
ordered
list

•  dl:
deﬁni)on
list

•  ul
and
ol
items
are
marked
as
li

•  In
dl
items
are
marked
as
dt
and
dd

Links

•  See:

–  hSp://www.cs.tut.ﬁ/~jkorpela/webjulk/1.5.html

•  Link
to
outside

–  <a
href="hSp://www.tamk.ﬁ">tamk</a>

•  Link
within
page

–  <a
href=”dog.html">Dog</a>

Images

•  Use
gif,
jpeg
or
png

•  img-‐element:

–  <img
src=”pic.jpg"
alt=”alterna)ve
text"/>

•  Img
as
link

–  <a
href=”dog.html"><img
src=”dog.png"

alt=”dog"/></a>

Tables

Title Title Title
Cell Cell Cell
Cell Cell Cell

Tables

<table>
<tr>
<td>cell</td>
<td>cell</td>
</tr>
<tr>
<td>cell</td>
<td>cell</td>
</tr>
</table>

Table:
Heading

<table>
<tr>
<th>Name</th>
<th>Telephone</th>
<th>Telephone</th>
</tr>
<tr>
<td>Bill Gates</td>
<td>555 77 854</td>
<td>555 77 855</td>
</tr>
</table>

Combining
Rows
and
Cols

<table>
<tr>
<td colspan="3">Title</td>
</tr>
<tr>
<td>Title</td>
<td colspan="2">cell</td>
</tr>
<tr>
<td>cell</td>
<td>cell</td>
<td>cell</td>
</tr>
</table>

CASCADING
STYLE
SHEETS

CSS

•  CSS
is
a
stylesheet
language
used
to
describe

the
presenta)on
of
a
document
wriSen
in

markup
language

•  Usually
used
with
(x)html

•  Deﬁning
fonts,
colors
and
layout

•  Separates
document
content
and
presenta)on

History

•  CSS1
spec
ﬁnished
1996,
it
took
three
years
before

browsers
supported
CSS1

•  2000
IE
5.0
for
Mac
was
the
ﬁrst
browser
to
fully

support
CSS1

•  =>
CSS
Filtering

•  S)ll
hundreds
of
bugs
in
browsers

CSS
support
today

•  Compe))on

–  Mozilla
Gecko
engine
(FireFox,
Mozilla)

–  Presto
Layout
engine
(Opera)

–  WebKit
(Apple
Safari,
Konquer,
S60
Browser)

–  Internet
Explorer

•  CSS
and
browser
compa)bility:

–  hSp://www.quirksmode.org/css/contents.html

Before
CSS

•  Presenta)on
was
part
of
the
document

structure:

<h2 align="center">
<font color="red" size="+4" face="Times New Roman, serif">
<i>Usage of CSS</i>
</font>
</h2>

•  Many
problems…

Using
CSS

•  Structure
is
clear:

<h2>Usage of CSS</h2>
•  Presenta)on
is
clear:

h2 {
text-align: center;
color: red;
font: italic large "Times New Roman", serif;
}

CSS
Possibili)es

•  Colors,
fonts,
layout,
sizes,
borders..

•  Possible
to
do
diﬀerent
css
–
ﬁles
for
prin)ng,

mobile
devices,
desktop
computers.

•  See

–  hSp://www.csszengarden.com/

CSS
Linking

<html>
<head>
<title>Page</title>
<link rel="stylesheet"
type="text/css"
media="screen"
href="screen.css" />
</head>
<body>
<h1>Title</h1>
<p>paragraph</p>
</body>
</html>

CSS
Linking

<html>
<head>
<title>Sivu</title>
<link rel="stylesheet" type="text/css" media="screen"
href="screen.css" />
<link rel="stylesheet" type="text/css" media="handheld"
href="mobile.css" />
<link rel="stylesheet" type="text/css" media="print"
href="print.css" />
</head>
<body>
<h1>Title</h1>
<p>paragraph</p>
</body>
</html>

CSS
General
Form

•  CSS
general
form

–  selector
declara)on

•  Example:

–  h1
{
color:
blue;
}

•  h1
=
selector

•  color:
blue;
=
declara)on

Selectors

•  Element
(h1)

•  Class
(.important)

•  Class
(h1.important)

•  ID
(#important)

•  Contextual
(h1
p)

•  Pseudo
(a:link)

Element

•  XHTML:

<h1>Otsikko</h1>!
•  Css:

h1 {!
color: RGB(255,0,0);!
}!

Class

•  XHTML:

<h1 class="tarkea">Otsikko</h1>!
<p>Tässä tekstiä ja tämä <span
class="tarkea">erityisen tärkeää
tekstiä</span></p>!
<p class="tarkea">Ja tämä vasta tärkeää
onkin</p>!
•  Css:

.tarkea {!
color: RGB(255,0,0);!
}!

Class

•  Css:

h1.tarkea {!
color: RGB(255,0,0);!
}!

ID

•  XHTML:

<h1 id="paaotsikko">Otsikko</h1>!
•  Css:

#paaotsikko {!
color: RGB(255,0,0);!
}!

Contextual

•  XHTML:

<ul>!
<li>Porkkana</li>!
</ul>!
•  Css:

ul li{!
color: RGB(255,0,0);!
}!
•  This
is
diﬀerent!

•  h1, p{!
color: RGB(255,0,0);!
}!

Pseudo

•  Example:

<a href="http://www.tamk.fi/">TAMK</a>!

a:link { color: red; }!
a:visited { color: blue; }!
a:active { color: lime; }!
a:hover { color: green; }!

Font-‐family

•  sans-‐serif,
example:
Helve)ca

•  serif,
example:
Times

•  cursive,
example:
Zapf-‐Chancery

•  fantasy,
example:
Impact

•  monospace,
example:
Courier

•  Example:

–  font-‐family:
verdana,
arial,
sans-‐serif

font-‐style,
font-‐weight

•  Font-‐style

–  normal
(default),
italic,
oblique

–  example:

•  font-‐style:
italic;

•  Font-‐weight:

–  normal,
bold,
bolder,
lighter,
100,
200
...
900

–  normal
=
400

–  bold
=
700

–  bolder
and
lighter

font-‐size

•  It’s
possible
to
deﬁne
the
font
size
absolutely,

rela)vely,
using
unit
of
length
or
by

percentage

–  font-size: x-small; /* absolute */
–  font-size: larger; /* relative */
–  font-size: 12pt; /* unit of length */
–  font-size: 80%; /* percentage */

Colors

color: red;
color: rgb(255,0,0);
color: #FF0000;
color: #F00;

Background

•  Background
color:

–  background-‐color:
#C0C0C0;

•  Background
image:

–  background-‐image:
url("marble.gif");

–  Repeat

•  repeat
(default):
repeat
both
direc)ons

•  repeat-‐x:
repeat
horizontally

•  repeat-‐y:
repeat
ver)cally

•  no-‐repeat:
no
repeat

–  background-‐aSachment:
ﬁxed
|
scroll

•  Is
the
image
s)ll
or
does
it
move
when
scrolling

Background
Image
Posi)on

background-position: right top; /* right upper-corner */
background-position: 100% 0%; /* right upper-corner */
background-position: 100%; /* right upper-corner */
background-position: center bottom;/* center bottom */
background-position: 50% 100%; /* center bottom */
background-position: 100%; /* right top */
background-position: 50% 10px; /* center 10 pixels from top */

Text
Features

•  word-‐spacing

•  leSer-‐spacing

•  text-‐decora)on

–  underline

–  overline

–  line-‐through

–  blink

Text
Features

•  ver)cal-‐align

–  baseline,
middle,
sub,
super,
text-‐top,
text-‐boSom,
top,
boSom,

prosenyluku

•  text-‐transform

–  capitalize,
uppercase,
lowercase

•  text-‐align

–  lez,
right,
center,
jus)fy

•  text-‐indent

•  line-‐height

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