What is CSS selector specificity and how does it work?

What is Specificity? If there are two or more conflicting CSS rules that point to the same element, the browser follows some rules to determine which one is most specific and therefore wins out. Think of specificity as a score/rank that determines which style declarations are ultimately applied to an element.

Why is specificity important in CSS?

Summary. From this article, we can see that CSS specificity is an important topic to understand because it can save you hours of debugging. With this knowledge, you can easily find out why your styles are not being applied. CSS specificity is a set of rules that determine which style is applied to an element.

What is CSS Z index?

The z-index CSS property sets the z-order of a positioned element and its descendants or flex items. Overlapping elements with a larger z-index cover those with a smaller one.

How does the CSS specificity work?

How does it work? Specificity is a weight that is applied to a given CSS declaration, determined by the number of each selector type in the matching selector. When multiple declarations have equal specificity, the last declaration found in the CSS is applied to the element.

What is CSS specificity hierarchy?

CSS Specificity: An Overview Specificity determines, which CSS rule is applied by the browsers. Specificity is usually the reason why your CSS-rules don’t apply to some elements, although you think they should. Every selector has its place in the specificity hierarchy. If two selectors apply to the same element, the one with higher specificity wins.

How CSS selector specificity is calculated?

A selector’s specificity is calculated as follows: If the element has inline styling, add “1” point to column “a”. For each ID value, add “1” point to column “b” – (0,1,0,0 points) For each class value (or pseudo-class or attribute selector), add “1” point to column “c” – (0,0,1,0 points) For each element reference (or pseudo-element), add “1” point to column “d” – (0,0,0,1 points)

What are rules in CSS?

The At-Rules of CSS. The at-rule is a statement that provides CSS with instructions to perform or how to behave. Each statement begins with an @ followed directly by one of several available keywords that acts as the identifier for what CSS should do. This is the common syntax, though each at-rule is a variation of it.