In what order does the cascade look at factors to determine which css rule to follow?

CSS stands for Cascading Style Sheets, and that first word cascading is incredibly important to understand — the way that the cascade behaves is key to understanding CSS.

At some point, you will be working on a project and you will find that the CSS you thought should be applied to an element is not working. Usually the problem is that you have created two rules which could potentially apply to the same element. The cascade, and the closely-related concept of specificity, are mechanisms that control which rule applies when there is such a conflict. Which rule is styling your element may not be the one you expect, so you need to understand how these mechanisms work.

Explanation:

Stylesheets cascade — at a very simple level this means that the order of CSS rules matter; when two rules apply that have equal specificity the one that comes last in the CSS is the one that will be used.

In the below example, we have two rules that could apply to the h1. The h1 ends up being colored blue — these rules have an identical selector and therefore carry the same specificity, so the last one in the source order wins.

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