Start learning with our library of video tutorials taught by experts. Get started

CSS3 First Look

Structural selectors


From:

CSS3 First Look

with James Williamson
Expand all | Collapse all
  1. 3m 5s
    1. Welcome
      1m 20s
    2. Using the exercise files
      1m 45s
  2. 31m 30s
    1. What is CSS3?
      5m 26s
    2. The current status of CSS3
      3m 35s
    3. An overview of CSS3 capabilities
      2m 24s
    4. Can you use CSS3 now?
      5m 31s
    5. Detecting support for CSS3
      9m 0s
    6. Understanding vendor prefixes
      5m 34s
  3. 1h 9m
    1. An overview of child and sibling selectors
      3m 11s
    2. Using child and sibling selectors
      7m 17s
    3. An overview of attribute selectors
      3m 19s
    4. Using attribute selectors
      8m 32s
    5. Pseudo-class UI selectors
      5m 56s
    6. Negation pseudo-class selectors
      6m 48s
    7. Target pseudo-class selectors
      5m 39s
    8. Structural selectors
      3m 58s
    9. Nth-child selector syntax
      10m 0s
    10. First, last, and only structural selectors
      5m 39s
    11. Using structural selectors to write more efficient code
      8m 52s
  4. 45m 28s
    1. Color formats in CSS3
      7m 9s
    2. Transparency in CSS3
      9m 10s
    3. CSS3 gradients
      4m 11s
    4. Creating linear gradients
      13m 57s
    5. Creating radial gradients
      11m 1s
  5. 49m 8s
    1. Working with web fonts
      6m 38s
    2. @font-face syntax
      4m 52s
    3. Downloading sample fonts
      6m 5s
    4. Writing @font-face declarations
      7m 57s
    5. Using web fonts
      6m 42s
    6. Using text shadows
      7m 14s
    7. Creating multi-column text
      9m 40s
  6. 50m 55s
    1. An overview of the flexible box model
      4m 42s
    2. Controlling box orientation
      5m 2s
    3. Setting element flexibility
      12m 59s
    4. Distributing boxes
      7m 54s
    5. Controlling box alignment
      12m 38s
    6. Working with box-sizing
      7m 40s
  7. 1h 5m
    1. Using border-radius
      6m 20s
    2. Creating custom rounded corners
      10m 21s
    3. Understanding border images
      5m 15s
    4. Using border images
      8m 52s
    5. Creating box shadows
      8m 58s
    6. CSS3 backgrounds
      4m 55s
    7. Controlling background size
      8m 46s
    8. Creating multiple background images
      6m 4s
    9. Using background-origin
      3m 18s
    10. Clipping background content
      3m 2s
  8. 40m 8s
    1. An overview of CSS3 2D transforms
      4m 26s
    2. Using 2D transforms
      8m 16s
    3. Setting transform origins
      5m 24s
    4. An overview of CSS3 transitions
      5m 0s
    5. Animating CSS properties
      6m 12s
    6. Using easing in animations
      5m 41s
    7. An overview of 3D transforms
      5m 9s
  9. 37m 56s
    1. Understanding media queries
      6m 18s
    2. Strategies for targeting multiple devices
      6m 4s
    3. Writing styles for target screen sizes
      12m 11s
    4. Deploying styles through media queries
      3m 55s
    5. Basing media queries on page orientation
      2m 24s
    6. Targeting media queries for iOS devices
      7m 4s
  10. 1m 6s
    1. Goodbye
      1m 6s

Video: Structural selectors

It's easy at first to overlook the new structural selectors in CSS3. At first glance, they look rather secure and frankly they aren't getting the amount of press that features such as gradients, transitions, and rounded corners are. However, I want to make a rather bold statement here. Structural selectors are more likely to change the way you write your CSS than any other addition to CSS3. So what are structural selectors? Well, they are pseudo-class selectors that allow you to select elements on the page based on how they fit into the Document Object Model tree without the use of attributes or labels like classes or IDs.

Watch this entire course now—plus get access to every course in the library. Each course includes high-quality videos taught by expert instructors.

Become a member
Please wait...
CSS3 First Look
6h 34m Appropriate for all Nov 29, 2010

Viewers: in countries Watching now:

In CSS3 First Look, staff author James Williamson provides an in-depth introduction to the newest CSS standard, detailing its modular format, history, and current level of browser support, while also demonstrating its capabilities and applications. The course includes tutorials on using new selectors, modifying typography and color, working with the box model, and understanding media queries. Exercise files accompany the course.

Topics include:
  • Understanding the history of CSS3
  • Working with the new selectors
  • Adding transparency and gradients
  • Specifying web fonts with @font-face
  • Understanding the advances to page layout
  • Looking at CSS3 box model capabilities
  • Using 2D and 3D transforms
  • Understanding media queries
Subject:
Web
Software:
CSS
Author:
James Williamson

Structural selectors

It's easy at first to overlook the new structural selectors in CSS3. At first glance, they look rather secure and frankly they aren't getting the amount of press that features such as gradients, transitions, and rounded corners are. However, I want to make a rather bold statement here. Structural selectors are more likely to change the way you write your CSS than any other addition to CSS3. So what are structural selectors? Well, they are pseudo-class selectors that allow you to select elements on the page based on how they fit into the Document Object Model tree without the use of attributes or labels like classes or IDs.

Think about the implications of that for a moment. Structural selectors allow you to traverse the document object and target elements based on their relationship to each other. That is amazingly powerful and if used correctly can dramatically increase the efficiency of our code by reducing the need for non-semantic markup dedicated to styling. Let's take a quick look at these pseudo- class selectors before breaking out and exploring them in more detail individually. Now first up is the root structural pseudo-classes selector.

The root pseudo-class selector always refers to the documents route element. In HTML, this would be the HTML element. The empty pseudo-class selector allows you to target any empty elements of a specific type. This is a great way of accounting for margins of empty paragraphs or adding a styling identifier for debugging pages. Now first-child and last-child includes the only CSS2 structural selector as first-child was introduced in CSS2. Now as you would expect, the first- child selector targets an element that is the first-child of another element and the last-child targets the last-child of a specific element.

First of type and last of type allow you to target first and last elements of a parent element by their type. Now this is a bit more flexible than first and last-child, as you can target elements that aren't necessarily the first or last elements within their parent, just the first and last of their type. Only-child and only-of-type allow you to target child elements when they are the only elements with a parent. Only-child will target any element with a parent when it is the only child element, regardless of its type.

Only-of-type allows you to target a specific type of child element when it is the only one of its type within the parent. Now there's an important note here. Both of these selectors will produce similar results to any of the last- child or last-of-type selectors. However, these selectors have a lower specificity and will be overwritten by those other structural selectors. That's a really important note. Finally, I want to take a look at nth-type selectors. These are amazingly powerful selectors that allow you to target multiple child elements based on an argument passed into the selector.

As you can see there are four variations of nth-type selectors. Most related to selectors we've explored earlier. Since the syntax for nth-type selectors is a bit specialized, we will examine it in its own movie in just a moment. Support for structural selectors like most CSS3 selectors is fairly widespread. However, I want to point out the lack of support for these selectors in Internet Explorer. Since they allow for such efficient targeting, it's tempting to use them now. However, if you're going to change the way you write selectors based on their ability to traverse the DOM, you will need do account for Internet Explorer.

To do that, I recommend taking a look at Selectivizr. Selectivizr is a free JavaScript library that allows you to emulate CSS3 attributes selectors and pseudo-class selectors. It does all this without requiring you to write any JavaScript at all, which is really nice if you're not that into writing JavaScript. I should also point out that Selectivizr does require an existing JavaScript framework in order to function. So be sure to read up on the documentation.

Find answers to the most frequently asked questions about CSS3 First Look.


Expand all | Collapse all
Please wait...
Q: I'm following along with the video "Transparency in CSS3".  James shows us how to achieve transparency in Internet Explorer by going to Kimili.com and entering a HSLA value to generate code for transparency.

Here that code:

background: transparent;-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#BF0E0C0B,endColorstr=#BF0E0C0B)"; /* IE8 */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#BF0E0C0B,endColorstr=#BF0E0C0B); /* IE6 & 7 */ zoom: 1;

When this code is added to my HTML file it removes transparency on browsers that do in fact support it. So I'm left with NO transparency. Why?
A: The problem is in the filter code. If the IE background is called last, the first "transparent" declaration will remove all previous colors, regardless of browser. To resolve this, place the rule inside a conditional comment for IE or remove the "transparent" declaration at the front of the rule.
Share a link to this course
Please wait... Please wait...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.
Upgrade now


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ.

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

Upgrade now

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed CSS3 First Look.

Return to your organization's learning portal to continue training, or close this page.


OK

Course retiring soon

CSS3 First Look will be retired from the lynda.com library on April 24, 2014. Training videos and exercise files will no longer be available, but the course will still appear in your course history and certificates of completion.


Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferencesfrom the dropdown menu.

Continue to classic layout Stay on new layout
Welcome to the redesigned course page.

We’ve moved some things around, and now you can



Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked