The CSS class within an ID takes priority

Within this code snippet, there are two nested div elements - the outer one is identified by an ID and the inner one is identified by a class:

<div id="theID">
    <div class="aClass">Text inside ID</div>
</div>

Suppose we have style rules for both the class and the ID:

.aClass {color: green; }
#theID { color: yellow; }

Based on my understanding, both rules should apply to the text with higher specificity (#theID) taking precedence.

However, in this case, the class rule takes priority and the text appears green instead of yellow.

What could be causing this unexpected behavior?

csscss-specificity

Answer №1

Thank you to all. To clarify, specificity prioritization is only implemented when multiple rules are applied DIRECTLY to the element.

Otherwise, the parent's style sheet will take precedence and be calculated in a similar manner.

Let's look at another example:

<div id="theID">
    <div class="aClass">
      <p>Class within ID and inside P</p>
    </div>
</div>

And the corresponding CSS:

.aClass p {
    text-transform: lowercase;
}
#theID p {
    text-transform: uppercase;
}

In this case, both rules directly apply to the <p> element, but the second rule takes precedence due to the higher specificity of an ID selector.

Therefore, the resulting text will be displayed in uppercase letters.

Answer №2

#identifier is uniquely targeting the outer division (applied directly, rather than inherited) causing all text contained within to display in yellow. Conversely, .aStyle directs the styling specifically to the inner division resulting in all content being displayed in green (direct style) instead of yellow (inherited style).

Answer №3

The browser processes CSS information starting from the outer elements and moving towards the inner elements.

First, the outer element is considered before the inner elements are evaluated.

<div id="theID">
   I am Yellow
   <div class="aClass">I am Green</div>
</div>

Here's another example:

<div id="theID">
   I am Yellow
   <div class="aClass">
       <span style="color:purple">
          I am purple
       </span>
   </div>
</div>

In case of conflicting styles, the style of the last element will take precedence.

Answer №4

Each individual component is equipped with its own unique set of CSS properties. Take for example, the presence of two div elements, each having its own distinct color property specified. These properties are clearly defined for both elements without any conflicting CSS rules, ensuring there is no ambiguity regarding specificity or inheritance.

The phrase “Class inside ID” represents the textual content within the inner div element, thus inheriting its designated color. Although a color setting exists for the outer element, it would only impact any text enclosed within that element which lacks its own separate color specification. In this scenario, there is no such text present without an internally assigned color, rendering the outside setting redundant.

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