Web Programming Step by Step

Lecture 4
Page Sections and the CSS Box Model

Reading: 4.1 - 4.2; 4.4.1

Except where otherwise noted, the contents of this presentation are Copyright 2010 Marty Stepp and Jessica Miller.

Valid XHTML 1.1 Valid CSS!

4.1: Styling Page Sections

Motivation for page sections

flow

The HTML id attribute (3.2.2)

<p>Spatula City!  Spatula City!</p>
<p id="mission">Our mission is to provide the most
spectacular spatulas and splurge on our specials until our
customers <q>esplode</q> with splendor!</p>

Linking to sections of a web page

<p>Visit <a href=
		"http://www.textpad.com/download/index.html#downloads">
	textpad.com</a> to get the TextPad editor.</p>

<p><a href="#mission">View our Mission Statement</a></p>

CSS ID selectors

#mission {
	font-style: italic;
	font-family: "Garamond", "Century Gothic", serif;
}

Spatula City! Spatula City!

Our mission is to provide the most spectacular spatulas and splurge on our specials until our customers esplode with splendor!

The HTML class attribute (3.2.3)

<p class="shout">Spatula City!  Spatula City!</p>
<p class="special">See our spectacular spatula specials!</p>
<p class="special">Today only: satisfaction guaranteed.</p>

CSS class selectors

.special {                   /* any element with class="special" */
	background-color: yellow;
	font-weight: bold;
}
p.shout {                    /* only p elements with class="special" */
	color: red;
	font-family: cursive;
}

Spatula City! Spatula City!

See our spectacular spatula specials!

Today only: satisfaction guaranteed.

Multiple classes

<h2 class="shout">Spatula City!  Spatula City!</h2>
<p class="special">See our spectacular spatula specials!</p>
<p class="special shout">Satisfaction guaranteed.</p>
<p class="shout">We'll beat any advertised price!</p>

Spatula City! Spatula City!

See our spectacular spatula specials!

Satisfaction guaranteed.

We'll beat any advertised price!

CSS for following examples

.special {
	background-color: yellow;
	font-weight: bold;
}
.shout {
	color: red;
	font-family: cursive;
}

Sections of a page: <div> (4.1.1)

a section or division of your HTML page (block)

<div class="shout">
	<h2>Spatula City!  Spatula City!</h2>
	<p class="special">See our spectacular spatula specials!</p>
	<p>We'll beat any advertised price!</p>
</div>

Spatula City! Spatula City!

See our spectacular spatula specials!

We'll beat any advertised price!

Inline sections: <span> (4.1.2)

an inline element used purely as a range for applying styles

<h2>Spatula City!  Spatula City!</h2>
<p>See our <span class="special">spectacular</span> spatula specials!</p>
<p>We'll beat <span class="shout">any advertised price</span>!</p>

Spatula City! Spatula City!

See our spectacular spatula specials!

We'll beat any advertised price!

CSS context selectors (4.1.3)

selector1 selector2 {
	properties
}
selector1 > selector2 {
	properties
}

Context selector example

<p>Shop at <strong>Hardwick's Hardware</strong>...</p>
<ul>
	<li>The <strong>best</strong> prices in town!</li>
	<li>Act while supplies last!</li>
</ul>
li strong { text-decoration: underline; }

More complex example

<div id="ad">
	<p>Shop at <strong>Hardwick's Hardware</strong>...</p>
	<ul>
		<li class="important">The <strong>best</strong> prices!</li>
		<li>Act <strong>while supplies last!</strong></li>
	</ul>
</div>
#ad li.important strong { text-decoration: underline; }

4.2: Introduction to Layout

The CSS Box Model (4.2.1)

box model

Document flow - block elements

flow

Document flow - block and inline elements

flow

CSS properties for borders

h2 { border: 5px solid red; }

This is a heading.

property description
border thickness/style/size of border on all 4 sides

More border properties

property description
border-color, border-width,
border-style
specific properties of border on all 4 sides
border-bottom, border-left,
border-right, border-top
all properties of border on a particular side
border-bottom-color, border-bottom-style,
border-bottom-width, border-left-color,
border-left-style, border-left-width,
border-right-color, border-right-style,
border-right-width, border-top-color,
border-top-style, border-top-width
properties of border on a particular side
Complete list of border properties

Border example 2

h2 {
	border-left: thick dotted #CC0088;
	border-bottom-color: rgb(0, 128, 128);
	border-bottom-style: double;
}

This is a heading.

CSS properties for padding

property description
padding padding on all 4 sides
padding-bottom padding on bottom side only
padding-left padding on left side only
padding-right padding on right side only
padding-top padding on top side only
Complete list of padding properties

Padding example 1

p { padding: 20px; border: 3px solid black; }
h2 { padding: 0px; background-color: yellow; }

This is the first paragraph

This is the second paragraph

This is a heading

Padding example 2

p {
	padding-left: 200px; padding-top: 30px;
	background-color: fuchsia;
}

This is the first paragraph

This is the second paragraph

CSS properties for margins

property description
margin margin on all 4 sides
margin-bottom margin on bottom side only
margin-left margin on left side only
margin-right margin on right side only
margin-top margin on top side only
Complete list of margin properties

Margin example 1

p {
	margin: 50px;
	background-color: fuchsia;
}

This is the first paragraph

This is the second paragraph

Margin example 2

p {
	margin-left: 8em;
	background-color: fuchsia;
}

This is the first paragraph

This is the second paragraph

CSS properties for dimensions (4.3, 4.4.1)

p { width: 350px; background-color: yellow; }
h2 { width: 50%; background-color: aqua; }

This paragraph uses the first style above.

An h2 heading

property description
width, height how wide or tall to make this element
(block elements only)
max-width, max-height,
min-width, min-height
max/min size of this element in given dimension

Centering a block element: auto margins

p {
	margin-left: auto;
	margin-right: auto;
	width: 750px;
}

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