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External CSS keeps style rules in a separate stylesheet linked by the HTML document. That separation can make a website easier to maintain, but a correct-looking file is useless if the browser cannot load it. Verify the actual resource and cascade before adding duplicate rules to compensate for an installation problem.
Link the intended stylesheet correctly
Use an appropriate link element with rel set to stylesheet and the correct href in the document. Confirm how relative paths resolve from the page URL. A stylesheet filename is a convention, not a guarantee that the server serves the expected content. Inspect the network request and response type rather than assuming a file exists because a folder listing shows it.
Check loading before changing selectors
Use browser developer tools to check whether the request succeeds and contains the intended CSS. Consider redirects, access controls, cache state and blocked mixed content. A success page containing HTML is not the stylesheet you meant to load. Avoid repeatedly disabling caches or security controls without identifying the underlying resource issue.
Inspect applied rules and avoid duplication
Once loaded, inspect a representative element and its matched rules. Other stylesheets, layers or inline styles can influence the result through the cascade. Do not paste the same rule into several places as a permanent workaround. Document stylesheet ownership and test the affected pages after changes, especially on a site with theme and plugin styles.
A practical checklist
- Confirm the link element and resolved URL.
- Inspect the actual resource response.
- Separate loading problems from cascade behavior.
- Use developer tools to review matched rules.
- Keep ownership and stylesheet placement clear.
Worked example
Illustrative example: a page links to assets/site.css from a nested route, but the relative URL resolves to the wrong location. The developer corrects the intended path and verifies the response contains CSS. They then inspect a component’s styles. No duplicate inline rules are needed to hide the loading failure.
Common questions
Is the name style.css mandatory? No. Does a 200 response always prove a stylesheet loaded correctly? No; inspect content and browser behavior. Does moving rules into a file automatically improve every performance metric? No; measure the actual page.
What to do next
Keep one understandable stylesheet-loading path for the component or site. Verify the resource first, then reason about selectors and the cascade.