Head First HTML with CSS

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when to use classes Welcome back, and good timing. We’re just about to listen in on an interview with an XHTML class... 414 Chapter 10 The Class Exposed This week’s interview: are classes always right? Head First: Hey, Class; you know we’ve been making good use of you, but we still don’t know a lot about you. Class: Well, there’s not all that much to know. If you want to create a “group, ” so to speak, that you can style, just come up with a class, put your elements in it, and then you can style all the elements in that class together. Head First: So the class lets you take sets of elements and apply one or more style properties to them? Class: Exactly. Say you have some holiday-themed areas in your page; one Halloween, one Christmas. You could add all Halloween elements to the “halloween” class and all Christmas elements to the “christmas” class. Then you can style those elements independently, say orange for Halloween and red for Christmas, by writing rules that apply to each class. Head First: That makes a lot of sense. We just saw a good example of that in this chapter, didn’t we? Class: I’m not sure, I was off working. You’ll have to catch me up. Head First: Well, we have a paragraph on the Head First Lounge page that contains a written guarantee from the owners, and they want this paragraph to stand out independently of the other paragraphs. Class: So far, so good... but let me ask you this: are there a few of these paragraphs, or just the one? Head First: Well, I don’t think there is any reason to have multiple guarantee paragraphs and I don’t see the same style being applied anywhere else in the page, so just the one. Class: Hmmm, I don’t like the sound of that. You see, classes are meant to be used for styles that you want to reuse with multiple elements. If you’ve got one unique element that you need styled, that’s not really what classes are for. Head First: Wait a second – a class seemed to work perfectly... how can this be wrong? Class: Whoa, now, don’t freak out. All you need to do is switch your class attribute to an id attribute. It will only take you a minute.
Head First: An id attribute? I thought those were for those destination anchors, like in Chapter 4? Class: ids have lots of uses. They’re really just unique identifiers for elements. Head First: Can you tell us a little more about id attributes? This is all news to me. I mean, I just went through an entire chapter using class incorrectly! Class: Hey, no worries; it’s a common mistake. Basically all you need to know is that you use a class when you might want to use a style with more than one element. And, if what you need to style is unique and there’s only one on your page, then use an id. The id attribute is strictly for naming unique elements. Head First: Okay, I think I’ve got it, but why does it really matter? I mean, class worked just fine for us. Class: Because there are some things you really want only one of on your page. The guarantee paragraph you mentioned is one example; but there are better examples, like the header or footer on your page, or a navigation bar. You’re not going to have two of those on a page. Of course, you can use a class for just one element, but someone else could come along and add another element to the class, and then your element won’t have a unique style anymore. It also becomes important when you are positioning HTML elements, which is something you haven’t gotten to yet. Head First: Well, okay, Class. This conversation has certainly been educational for us. It sounds like we definitely need to convert that paragraph from a class to an id. Thanks again for joining us. Class: Anytime, Head First! ? brain power id class id class ❏ ❏ ❏ ❏ ❏ ❏ ❏ ❏ A paragraph containing the footer of a page. A set of headings and paragraphs that contain company biographies. An element containing a “picture of the day.” ❏ ❏ ❏ ❏ the box model Choose whether you’d use class or id for the following elements: A set of elements containing movie reviews. An element containing your to do list. elements containing Buckaroo Bonzai quotes. Answer: The footer, the picture of the day, and the to do list are great candidates for using id. you are here 415
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Head First HTML with CSS and XHTML
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the authors Authors of Head First H
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table of contents x 1 The No pressu
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table of contents xiv Here’s a lo
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table of contents xvi 7 Putting I l
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table of contents xx Weekly Elixir
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table of contents xxiv 15 The i Ind
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how to use this book Who is this bo
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how to use this book xxviii intro W
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how to use this book Here’s what
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how to use this book Read Me This i
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the review team Tech Reviewers Lous
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1 getting to know HTML The Language
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What does the Web server do? Web se
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What the browser creates... When th
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Sharpen your pencil You’re closer
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Your big break at Starbuzz Coffee S
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Creating the Starbuzz Web page Of c
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Step four: Change your TextEdit Pre
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Step two: Open Notepad Once you’v
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Meanwhile, back at Starbuzz Coffee.
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Opening your Web page in a browser
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Starbuzz Coffee Beverages House
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Are we there yet? You have an HTML
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Tags dissected... Okay, you’ve se
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Exercise Starbuzz Coffee’s Missio
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Meet the style element To add style
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Cruisin’ with style... It’s tim
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Exercise Now that you’ve put a li
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HTML CSS Right. In fact we’re tot
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6 6 15 6 6 15 14 Across HTMLcross I
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Starbuzz Coffee Beverage
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Exercise Solutions Starbuzz Coffe
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2 going further, with hypertext Mee
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elixir.html A page listing some ref
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2 3 Edit lounge.html Open “lounge
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What does the browser do? 1 First,
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Understanding attributes Attributes
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Attributes Exposed This week’s in
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Label Destination What you write in
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Organizing the lounge... Let’s gi
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I think the problem is that the bro
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3 4 Trace a path from the source to
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Going the other way; linking up int
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Q: What’s a parent folder? If I h
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Finding the path from “elixir.htm
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BULLET POINTS When you want to lin
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It’s time for the competition to
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Exercise Solutions Head First Lou
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Sharpen your pencil Solution “abo
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3 building blocks We better find so
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From Journal to Web site, at 12mph
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From a sketch to an outline Now tha
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Don’t forget, you always need the
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Adding some new elements You have t
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Wait a sec... you removed the doubl
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Five-Minute Mystery The Case of the
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Adding a Let’s get a into Tony
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Solved: The Case of the Elements Se
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there are no Dumb Questions Q: I th
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Inline Block Well, a lot of people
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Exercise Here’s what the changes
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Q: So, the only purpose of is to i
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Remember, it’s important to use t
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Step Two: Enclose your list items w
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Exercise Here’s another list from
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Putting one element inside anoth
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Using nesting to make sure your tag
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A bunch of HTML elements, in full c
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Q: Wow, I never knew the browser co
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BULLET POINTS n n n Rockin’ page.
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Exercise Solutions Here’s the rew
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Top 100 Top 100 Dark Side of the
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Exercise Solutions 9 L 7 B Across 4
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getting on the web Getting Starbuzz
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what’s the goal A Web Detour HELL
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what’s the goal A Web Detour Movi
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what’s the goal A Web Detour As m
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A Web Detour Q: My hosting company
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uniform resource locators Mainstree
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absolute paths to your files What
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easier urls 140 Chapter 4 I’d lik
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142 Chapter 4 Earl needs a little h
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linking to other web pages How do w
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testing those links And now for the
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time for a little mystery Five-Minu
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est practices for your links The ti
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creating destinations Using the el
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linking to a destination anchor Now
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case solved, its all about relative
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targeting windows Opening a new win
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a little brain crossover 160 Chapte
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exercise solutions Sharpen your pen
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exercise solutions Exercise Solutio
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images in your html How the browser
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how browsers load images 3 4 Having
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differences between gif and jpeg He
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when to use gif or jpeg 172 Chapter
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using urls with images : it’s not
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use the alt attribute for accessibi
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a fan site for ipods Creating the u
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inserting an image Sharpen your pen
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all about image sizes Q: What’s w
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choosing a photo editor 184 Chapter
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esizing an image Resizing the image
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using save for web As you can see,
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image saving and quality Save the i
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comparing image settings d 192 Chap
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viewing mypod with resized images T
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using thumbnail images Create the t
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images and layout Take myPod for an
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adding individual image pages Creat
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adding links to images Add the imag
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adding a logo 204 Chapter 5 The myP
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choosing between gif and jpeg What
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creating a transparent gif Save the
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setting a matte color Set the matte
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testing the transparent gif And now
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eview using images with html 214 Ch
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exercise solutions 216 Chapter 5 Ex
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6 standards, compliance, and all th
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standards, compliance, and all that
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HTML 4.01 Ah, the good life. HTML 4
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We can’t have your pages putting
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Okay, I think we’ve got it now. L
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See, piece of cake. The DOCTYPE is
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Validating the Head First Lounge We
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Fixing that error Okay, this looks
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See, we’re getting this error mes
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Making the validator (and more than
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Okay, it’s been more than a “fe
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I think we’ve been pretty darn st
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Do we have validation? standards, c
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Fixing the nesting problem So it lo
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Q: Okay, I think I get all this, an
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Webville Guide to Strict HTML 4.01
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there are no Dumb Questions Q: That
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Transitional Strict So, you’re ju
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Webville Forecast standards, com
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BULLET POINTS n HTML 4.01 is the HT
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Exercise Solutions standards, co
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7 moving to XHTML Putting an ‘X
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What is XML? Okay, we’re going to
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I don’t get it. We changed the DO
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XHTML is becoming the language of c
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If my HTML is transitional 4.01, an
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3 All empty tags should end in “
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Validation: it’s not just for HTM
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XHTML sounds like a good thing. Is
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HTML XHTML You’re forgetting a fe
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Across Micro XHTMLcross It’s been
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8 getting started with CSS Don’t
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getting started with css you are he
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Using CSS with XHTML We’re sure C
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Getting CSS into your XHTML Okay, y
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Cruising with style: the test drive
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Let’s put a line under the welcom
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Q: So how does that work when you h
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getting started with css Head F
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Sharpen your pencil Color in the el
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Getting the Lounge style into the e
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Linking from “lounge.html” to t
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Test driving the entire lounge... S
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Sharpen your pencil Now that you’
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It’s time to talk about your inhe
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Test drive your new CSS As usual, g
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Test drive Add a rule for the elem
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Adding a class to “elixir.html”
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A greentea test drive Save, and the
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Cool! Yes, that works. One more que
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And if we still don’t have a clea
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CSS XHTML You have to admit XHTML i
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If you have errors in your CSS, usu
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Making sure the Lounge CSS validate
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BULLET POINTS n n n CSS contains si
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Markup Magnets Solution Remember dr
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ody { } font-family: sans-serif; h1
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Who gets the inheritance? h1 and h2
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Exercise Solutions 2 S 11 L E R 3 1
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common text properties Text and fon
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overview of font families What is a
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develop your sense of fonts Bainbri
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improving tony’s journal Dusting
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some fonts questions Test driving T
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how to specify font sizes Adjusting
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using keywords for size 354 Chapter
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setting up tony’s font sizes Let
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some more questions on font size Q:
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using normal weight Test drive the
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using a font style Styling Tony’s
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Page 423 and 424: 10 the box model Getting Intimate w
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Page 427 and 428: A very quick test drive Let’s do
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Step three: styling the s Before we
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Hey guys, I know you think you’re
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How can you style elements based on
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Putting those pseudo-classes to wor
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Isn’t it about time we talk about
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The cascade For this exercise, you
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Q: What makes a specificity number
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Step five: Finally, sort any confli
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Super brain power ?This is a specia
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Sharpen your pencil Solution h1 Her
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Sharpen your pencil Solution Your j
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12 layout and positioning Arranging
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Use the flow, Luke The Flow is what
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What about inline elements? So you
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One more thing you should know abou
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How to float an element Let’s ste
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Behind the scenes at the lounge Now
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The new Starbuzz Let’s take a qui
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layout and positioning from at
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a:link { color: #b76666; text-decor
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I have an idea. In the future, why
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Fixing the two-column problem Are y
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Test drive As usual, save your “s
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Back to clearing up the overlap pro
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Q: Do margins collapse on floated e
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Step One: start with the sidebar We
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Liquid and Frozen Designs All the d
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Test driving with a tank of jello A
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Another example of absolute positio
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Using absolute positioning We’re
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Time for the absolute test drive Ma
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One tradeoff you can make to fix th
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Positioning the award We want the a
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Float Absolute layout and positioni
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Sharpen your pencil Time to put all
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How does fixed positioning work? Co
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Putting the coupon on the page Add
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Getting relative This is it, the la
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To three-columns and beyond... Whil
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XHTMLcross layout and positioning T
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Exercise Solutions Sharpen your pen
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Solution 12 F 5 J 1 V 2 F 3 Z 4 C I
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something new from tony 550 Chapter
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an xhtml table How to create a tabl
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tables up close Tables dissected Yo
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testing you on tables Artist Album
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checking out the unstyled table Tes
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tables and style Now let’s style
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cells and the box model 562 Chapter
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dealing with table borders Getting
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coloring cells How about some color
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using table spans Another look at T
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testing your table knowledge 570 Ch
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we need a nested table Four out of
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testing and improvements Test drivi
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how to override nested styles Overr
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ack to styling lists Giving the lis
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some finer points about styling lis
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some left brain action 582 Chapter
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exercise solutions Sharpen your pen
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exercise solutions 588 Chapter 13 J
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exercise solutions 1 S 590 Chapter
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owsers and forms How forms work If
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how to write a form What you write
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the form element How the form eleme
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overview of form elements What can
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more form elements What can go in a
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the bean machine Here’s what the
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creating the form Getting ready to
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form element names How form element
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adding input elements Back to getti
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using a select Adding the element
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providing choices ? brain power Cha
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adding checkboxes Exercise 614 Chap
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successful submission The final tes
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match the form names Your informat
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form methods: get and post POST GET
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test yourself, get and post Sharpen
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tabular versus presentation 624 Cha
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deciding how to style forms To Tabl
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the xhtml, continued Ship to: N
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styling the form Styling the form a
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other form elements What more could
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eview of forms 634 Chapter 14 BULLE
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exercise solutions 636 Chapter 14 S
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the end 638 Chapter 14 Congratulati
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specialized selectors #1 More Selec
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splitting your pages #2 Frames HTML
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web tools #4 Tools for Creating Web
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generating pages #6 Server-side Scr
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etter printing with css #8 More abo
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etter looking blogs #10 Blogs Weblo
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the index block elements flow 488-4
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the index CSS (continued) using wit
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the index forms (continued) picking
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the index images (continued) users
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the index No Dumb Questions !import
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the index passwords in forms 633 PD
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the index spanning rows and columns
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the index text, font size (continue
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