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CSS3 First Look

Clipping background content


From:

CSS3 First Look

with James Williamson

Video: Clipping background content

Background clip is very similar to background origin with a main difference being that it affects the actual painting of the background, not just its starting point. So let's take a closer look at that. I have the background_clip.htm open and the structure's pretty much the same thing we had before, so a single div tag and it's just sort of positioned with a background image inside of it. Again, we have that sort of translucent border that's going to help us understand where the background image is being painted.
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  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

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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

Clipping background content

Background clip is very similar to background origin with a main difference being that it affects the actual painting of the background, not just its starting point. So let's take a closer look at that. I have the background_clip.htm open and the structure's pretty much the same thing we had before, so a single div tag and it's just sort of positioned with a background image inside of it. Again, we have that sort of translucent border that's going to help us understand where the background image is being painted.

To give you a little bit more information, remember we have some padding on this. We have 25 pixels worth of padding all the way around the edges. Okay. So now what I am going to do is go down to my #one selector and I'm going to go ahead and write the background clip properties, so -moz-background-clip and once again I am going to do content- box, even though content does seem to be accepted by all the browsers. I am going to stick with the standard and use the -box. Copy that and paste it two more times, add webkit, and take away the vendor prefix.

Okay, so now let's save and preview that again and now we see a really dramatically different background image. Essentially what's happening is the painting of the background has now been clipped to the content area, so the padding is being ignored. Now I want you to pay special attention here to the fact that it's not just the background image. It's the entire background itself. Color, image, everything. So this is a nice way of sort of ignoring the border and the padding on an image and painting that background into a specific area. So that one capability is probably going to really help you out in several instances.

Let's try some of the alternates. We know padding-box is the default, so let's try border-box. So padding-box is the default just as it is for background origin. So I'll save that, preview that again, and now you can see the background is actually painting all the way to the edge. Now the really interesting thing about this, guys, is it's kind of hard to see. Probably you should make the background maybe a little darker, so that you can see the border being translucent. But the background is being painted now all the way up to the very edge of the border, not to the start to the border but all the way through it.

When you're dealing with semitransparent borders this can make a big difference with certain backgrounds. So I am going to go ahead and close out of that. Now while the difference between the last one I just showed you, the border-box and padding-box clipping, they're not likely to be noticeable unless you have a really custom border or you're using some type of a border image. However, that content clip property, it does creates some really compelling opportunities. Keep in mind the early nature of support for this property, as you begin to think about using it, and you really want to take care when combining this property with multiple backgrounds is it can have some unintended side effects.

Now like all CSS3 features, I recommend thoroughly experimenting with this property to see how it can help you in your own styles.

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


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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.
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