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Asked: 2026-06-03T13:40:02+00:00

I have to merge CSS files to one big CSS file to reduce connections

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I have to merge CSS files to one big CSS file to reduce connections made during page load. Basically if I just append CSS files to one big file, are these styles going to work exactly like before, or are there any issues when you merge multiple CSS files together? I’m developing my software in Java, if there is some library that already does CSS merging, I would like to hear about that.

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  1. Editorial Team

    If your CSS files use @import, then merging them into one file might change the imported URLs.

    When an @import has a relative URL it is resolved against the URL of the containing CSS, so you could end up inadvertently breaking @imports.

    http://www.w3.org/TR/css3-values/

    In order to create modular style sheets that are not dependent on the absolute location of a resource, authors should use relative URIs. Relative URIs (as defined in [URI]) are resolved to full URIs using a base URI. RFC 3986, section 3, defines the normative algorithm for this process. For CSS style sheets, the base URI is that of the style sheet, not that of the source document.

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