How Does Stylesheet Order Determine CSS Override Precedence?

Stylesheet Override Order in CSS

In HTML, stylesheets can be linked in the header to apply specific styles to the webpage. The order of these stylesheets determines which styles take precedence. In the scenario described, two stylesheets are linked: styles.css and master.css.

The order of override follows the rules of CSS cascading. The "last line" rule in CSS determines that the last-declared value of a property takes precedence over all previous declarations. However, this rule only applies within a single stylesheet. When it comes to multiple stylesheets, the following rules apply:

Cascade and Stylesheet References

The cascading element of CSS does not work identically for stylesheet references as it does for typical CSS functions. In terms of stylesheet references, the order in which the stylesheets are linked determines the precedence. The last-linked stylesheet overrides any conflicting rules in previously linked stylesheets.

Specificity and !important

The specificity of a CSS rule defines its weight. Rules with higher specificity take precedence over rules with lower specificity. Specificity is determined by the number of IDs, classes, and element names used in the selector. The !important declaration can also be used to override other rules.

Example

In the given scenario, master.css is linked after styles.css. Assuming both stylesheets contain rules for the body element, the rules in master.css will override the rules in styles.css for the following reasons:

• master.css is linked last.
• master.css contains more specific rules (e.g., html, body:not(input="button")) that override the more general rules in styles.css (e.g., body).

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