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CSS: Core Concepts

Working with opacity


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CSS: Core Concepts

with James Williamson
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  1. 4m 57s
    1. Welcome
      55s
    2. Using the exercise files
      4m 2s
  2. 1h 7m
    1. Exploring default styling
      4m 56s
    2. CSS authoring tools
      2m 29s
    3. CSS syntax
      4m 45s
    4. Writing a selector
      4m 10s
    5. Setting properties
      8m 40s
    6. Common units of measurement
      7m 47s
    7. Inline styles
      5m 1s
    8. Embedded styles
      5m 19s
    9. Using external style sheets
      10m 34s
    10. Checking for browser support
      8m 48s
    11. Dealing with browser inconsistencies
      5m 30s
  3. 2h 15m
    1. Structuring HTML correctly
      2m 51s
    2. Element selectors
      4m 52s
    3. Class selectors
      6m 4s
    4. ID selectors
      3m 27s
    5. Using classes and IDs
      10m 7s
    6. Element-specific selectors
      4m 35s
    7. The universal selector
      5m 42s
    8. Grouping selectors
      4m 49s
    9. Descendent selectors
      7m 32s
    10. Child selectors
      5m 7s
    11. Adjacent selectors
      5m 30s
    12. Attribute selectors
      12m 43s
    13. Pseudo-class selectors
      3m 54s
    14. Dynamic pseudo-class selectors
      8m 29s
    15. Structural pseudo-class selectors
      6m 45s
    16. Nth-child selectors
      13m 10s
    17. Pseudo-element selectors
      12m 40s
    18. Targeting page content: Lab
      8m 56s
    19. Targeting page content: Solution
      7m 59s
  4. 42m 39s
    1. What happens when styles conflict?
      4m 0s
    2. Understanding the cascade
      5m 47s
    3. Using inheritance
      6m 11s
    4. Selector specificity
      6m 55s
    5. The !important declaration
      4m 5s
    6. Reducing conflicts through planning
      3m 33s
    7. Resolving conflicts: Lab
      6m 45s
    8. Resolving conflicts: Solution
      5m 23s
  5. 1h 47m
    1. Setting a font family
      7m 10s
    2. Using @font-face
      9m 18s
    3. Setting font size
      7m 35s
    4. Font style and font weight
      6m 52s
    5. Transforming text
      3m 58s
    6. Using text variants
      2m 49s
    7. Text decoration options
      4m 26s
    8. Setting text color
      3m 2s
    9. Writing font shorthand notation
      8m 49s
    10. Controlling text alignment
      6m 33s
    11. Letter and word spacing
      9m 11s
    12. Indenting text
      4m 30s
    13. Adjusting paragraph line height
      10m 30s
    14. Controlling the space between elements
      6m 41s
    15. Basic text formatting: Lab
      8m 45s
    16. Basic text formatting: Solution
      7m 14s
  6. 2h 1m
    1. Understanding the box model
      16m 53s
    2. Controlling element spacing
      14m 29s
    3. Controlling interior spacing
      10m 49s
    4. Margin and padding shorthand notation
      6m 27s
    5. Adding borders
      8m 57s
    6. Defining element size
      10m 7s
    7. Creating rounded corners
      6m 58s
    8. Background properties
      2m 51s
    9. Using background images
      5m 10s
    10. Controlling image positioning
      10m 25s
    11. Using multiple backgrounds
      7m 5s
    12. Background shorthand notation
      5m 25s
    13. Styling container elements: Lab
      7m 55s
    14. Styling container elements: Solution
      8m 17s
  7. 47m 51s
    1. Color keyword definitions
      5m 4s
    2. Understanding hexadecimal notation
      6m 5s
    3. Using RGB values
      4m 58s
    4. Using HSL values
      5m 17s
    5. Working with opacity
      2m 23s
    6. Using RGBa and HSLa
      3m 8s
    7. Styling drop shadows
      5m 38s
    8. CSS gradients
      6m 32s
    9. Working with color: Lab
      4m 26s
    10. Working with color: Solution
      4m 20s
  8. 1m 58s
    1. Additional resources
      1m 58s

Video: Working with opacity

CSS gives us a couple of different ways to set the transparency of an element. I want to start exploring those by discussing the opacity property. And essentially opacity describes how opaque or transparent an element is and it's based on values from 0 to 1. Now that may seem a little counterintuitive, so let's go into the opacity.htm file, you can find that in 06_05 folder and kind of play around and experiment with that syntax. Now before we start writing any CSS, I want to preview this page in the browser for you, and you can see we have got some old friends back.

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CSS: Core Concepts
8h 49m Beginner Nov 22, 2011

Viewers: in countries Watching now:

In this hands-on course, James Williamson demonstrates the concepts that form the foundation of Cascading Style Sheets (CSS), including styling text, adding margins and padding, and controlling how images display. The course also explores the tools needed to work with CSS, the differences between embedded and external styles, how to use selectors to target elements, and what to do when styles conflict.

Topics include:
  • Exploring default styling
  • Writing a selector
  • Setting properties
  • Working with common units of measurement, including ems and pixels
  • Structuring HTML correctly
  • Understanding the cascade and inheritance
  • Setting a font family, font size, text color, and more
  • Understanding the box model
  • Styling container elements
  • Working with RGB vs. HSL values
  • Styling drop shadows
Subject:
Web
Software:
CSS
Author:
James Williamson

Working with opacity

CSS gives us a couple of different ways to set the transparency of an element. I want to start exploring those by discussing the opacity property. And essentially opacity describes how opaque or transparent an element is and it's based on values from 0 to 1. Now that may seem a little counterintuitive, so let's go into the opacity.htm file, you can find that in 06_05 folder and kind of play around and experiment with that syntax. Now before we start writing any CSS, I want to preview this page in the browser for you, and you can see we have got some old friends back.

So we are going to be using those banners that we completed in the last exercise, and you can see that I am using them just a sort to overlap this background back here. So I won't be able to really tell if these elements become semi-transparent or not. Okay. Let me go back into my code and we are going to be focusing on the banner1 and banner2 selectors, so I am going to be modifying these existing selectors that we have right up here. Okay, I am going to go down to the last property in (.banner1 {) and create a new line. And the property that we are looking for is opacity, all right, so the opacity property.

Now as I mentioned before, it gives you a value between zero and let's go ahead and set banner2's opacity to 1 and if I save this and test it, you can see no change here because one is equal to say 100% whereas zero totally transparent, it's equal to 0%. So how do we define a range? Well, for that we use decimals. So let's say, I wanted to make the top banner you know fairly transparent about maybe 50%, I would do .5 and if I wanted the second banner to be only slightly transparent, here we could go ahead and just do something like .8, and you could even do like .85, that would be fine.

So if I save this and test it in the browser, you can see that we have a very transparent first banner, and really a semi-transparent second banner. Now one of things I want to mention here is that, it really is nice to have this capability available to us. But opacity is limited, in the fact that you can only define the opacity of the entire element. So notice that it's sort of an all or nothing type thing here. Now there are going to be times when you want to control the foreground and background of an element separately. Now for that, we are going to talk about using RGBA and HSLA color definitions and we'll do that, in our next movie.

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