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CSS: Core Concepts
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Resolving conflicts: Solution


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CSS: Core Concepts

with James Williamson

Video: Resolving conflicts: Solution

Welcome back! Now in this movie I want to check your solutions to our resolving conflicts lab with my finished files. Now again, remember in CSS there are often multiple valid solutions, so don't assume that if your solutions don't match mine that they are incorrect. In those instances compare why you made the decisions to structure the selector the way that you did with my own rationale and decide which one you prefer. So to go over these files, I'm looking in the 03_07 finished_files folder. I have the galleries.htm opened up, and I have the main.css open from the _CSS file.
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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

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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

Resolving conflicts: Solution

Welcome back! Now in this movie I want to check your solutions to our resolving conflicts lab with my finished files. Now again, remember in CSS there are often multiple valid solutions, so don't assume that if your solutions don't match mine that they are incorrect. In those instances compare why you made the decisions to structure the selector the way that you did with my own rationale and decide which one you prefer. So to go over these files, I'm looking in the 03_07 finished_files folder. I have the galleries.htm opened up, and I have the main.css open from the _CSS file.

Now I just want to preview this in my browser so I can kind of see what our finish files looks like. Okay so our styling here is correct now. We've got the proper styling here. We've got the proper styling in our headlines. The dates are showing up the way we want them to. Over here in the paragraphs in the sidebar, they're sized the way that we want them to. So everything is looking pretty good. All right, so I'm going to go back into my code and I'm going to talk about the solutions that I came up with. So I'm going to go to the main.css, and I'm going to start with our first task, which was applying global default styling.

I'm going to go down to line 72, and I can see that I took all of those properties that we needed and I placed them inside of just a generic everyday body element tag selector. It's a smart choice, because applying this styling to the body element means that it's inherited by everybody on the page that can inherit it. It's also a basic rule, so it's easy for interior rules to override it if they need to. It's also towards the top of my code, the top of my styles, so it's applied first and then any of the other selectors below it that need to override it can also do that through the cascade.

So there's a lot of thought that went into where it is located and then the selector that we are actually using there. The second task we were given was to deal with the conflicting styles down around line 244. We had the articles section styles conflicting with the page-specific styles. Now I'm going to scroll down and show you what I did there. Okay, so around 244, in this case around 253 or so, are my article styles. And before, you may have remembered that we had the #content ID selector as part of these as well.

Well, that is way too specific. Remember IDs are 100, so each of these had specificities of 102, 103--very, very high. So it was very difficult for these page-specific styles that come after it to overwrite them. So there are a couple of different ways that you could have solved this. One is that you could have made these selectors here more specific, but since they already use ID selectors, adding another layer of ID selectors to them and making them even more specific than this was probably not the right choice.

In this case, the right choice was to go in and reduce the specificity of these selectors, allowing them to now be overwritten by these more specific selectors. Now if I scroll down a little bit more, here is a rule that I wrote to target just the heading 2s inside the galleries page. Now there are also a couple of different ways that you could have solved this. Number one, you could've gone over to the galleries.htm and you could've written an embedded style for that page. Some of you may have done that. That was not wrong solution. That works just fine. It would have worked okay.

It would've overwritten any type of rule here that would have targeted the galleries h2 as well. But I'm of the mind if I don't have to use the embedded style, I don't want to; I want to avoid that. So using the same type of rationale that these other selectors are using, I combined the h2 selector with the galleries ID--notice that I use the descendent selector with the space between them-- and that way I'm only targeting the h2 that's inside of that galleries region, which is only going to occur on the galleries page, and you can see that right there, article ID galleries. Perfect.

Now the last thing that we needed to do was to target the paragraphs in the sidebar, and I wanted to limit the styling to the paragraphs that were in the contest region. So if I scroll down to about line 567, so where did I place this? I placed this rule inside the aside styles regions. That's really where it belongs and I just took it almost all the way down, you know, towards the bottom of those rules. Now the selector that I wrote is a p element selector that's used in a descendent selector with the .contest.

If you looked over the structure of these, you'll notice that each of these sections has a class of contest applied to it. Yes, there are other ways to do this. I could've done aside, space, p; that would work just fine. There are other selectors that would worked as well. But I like using the class selector here because it really refines the fact that this should only be applied when it's on those contest sections. So it was specific enough; it is in the right place, in terms of organization within the style sheet; and it targets exactly the element that I'm looking for. Excellent! Now there are a lot of different solutions for how you could've done that, so if you did it a little bit differently than I did, don't feel that it's wrong.

Again, just compare your logic with mine and see which one you like best. Now honestly, the absolute best way to reduce the amount of conflicts in your styles is through planning and organization. By knowing how your site is going to structured and developing a strategy for organizing styles based on that structure, you can eliminate many of the conflicts before they even happen.

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