"Mastering the art of CSS: when the cascade goes

Can someone assist me with a tricky cascading style problem that is not so straightforward?

I need to override a CSS child style with another style of equal importance (012), without changing its order in the CSS sheet...

To see a concrete example, please visit this JSfiddle link: JSfiddle Example

The requirements for the style adjustment are:

  • Do not introduce a third selector (only modify the two given)
  • Maintain the order of style definitions (green before red)
  • Keep both selectors the same - if you change the green selector, the red selector must also change.
  • The actual HTML structure is more complex than provided here (the "a" element is not just inside a div child).

For instance, if .green div a changes to :

.green > * a

then the corresponding red selector should be:

.red > * a

The second link must have exactly the same selector (except for the color name).

EDIT: Why does it need to be done this way?

In my website, users can customize their theme colors. When viewing another user's profile, you see it in their chosen color theme but within your own theme setting. This means a green theme could be nested inside a red theme... with over 10 possible themes, it's not feasible to style every combination (green > red, red > green, blue > red, etc.).

css

Answer №1

To ensure consistency in styling, it is essential to adjust both rules equally. By analyzing the HTML structure, you can identify a more specific way to target the anchor elements. In the provided example, the classes .red and .green are positioned one div away from the anchor they intend to style. Therefore, by refining the selectors to style anchors that are only one div away, each rule will exclusively affect its intended anchor. For instance:

.green > div > a { color:green;}
.red > div > a { color:red;}

You can access the jsFiddle for this example here: http://jsfiddle.net/rgthree/54nUG/5/

Incorporating OP's Modifications

An effective approach to maintain a consistent theming convention is by implementing a separate attribute or prefix. Consider the following CSS snippet:

.theme-green a,
[class*="theme-"] .theme-green a {color:green;}
.theme-red a,
[class*="theme-"] .theme-red a {color:red;}

If all themes commence with 'theme-', the above code provides a solution to override styles effortlessly. Line 3 supersedes line 1 as usual, while the new line 2 takes precedence over line 3, allowing for cascading styles (e.g., applying green theme within a red theme). Nevertheless, this method may lead to duplicating CSS code.

Explore the updated jsFiddle here: http://jsfiddle.net/54nUG/10/

Answer №2

.emerald div a { color:emerald!important;}

Answer №3

Consider using a more targeted selector for your styles:

.red div.green div a { color:green;}
.red div a { color:red;}

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