Specificity and priority determine which CSS rule is applied when multiple rules target the same element. Understanding this concept is essential for writing clean, predictable styles.
What is CSS Specificity
Specificity is a ranking system used by the browser to decide which CSS rule is more important. Each selector type has a different weight.
Inline styles have the highest specificity. They are written directly inside HTML elements using the style attribute.
ID selectors are very strong and override class and element selectors.
Class selectors, attribute selectors, and pseudo classes have medium strength.
Element selectors and pseudo elements have the lowest strength.
Specificity Hierarchy
Inline styles override everything else.
ID selectors override class selectors and element selectors.
Class selectors override element selectors.
Element selectors have the lowest priority.
Example of Specificity
p {
color: blue;
}.text {
color: green;
}#title {
color: red;
}
If all these rules target the same paragraph, the text will appear red because the ID selector has higher specificity.
What is CSS Priority
Priority refers to the order in which styles are applied when specificity is equal.
When two selectors have the same specificity, the rule written last in the CSS file will be applied.
Example of Priority
p {
color: blue;
}p {
color: green;
}
The paragraph will be green because the second rule comes later.
Important Rule
The important keyword overrides all other rules, regardless of specificity.
p {
color: blue !important;
}#title {
color: red;
}
The text will remain blue because the important rule takes priority.
How Specificity is Calculated
Inline styles have the highest value.
ID selectors have higher value than classes.
Classes have higher value than elements.
The browser compares these values to decide which rule to apply.
Best Practices
Avoid using the important keyword unless absolutely necessary.
Use classes instead of IDs for better flexibility.
Keep your CSS simple and organized.
Write styles in a logical order to avoid conflicts.
Summary
Specificity decides which rule is stronger.
Priority decides which rule is applied when strength is equal.
Understanding both helps you control your website design more effectively.
If you want, I can also create exercises or quizzes for this topic.