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Example: We have a very small project - 1 folder with only 3 files in our project: - main.css - wrong_img.png - wrong_css.css /** Here is how main.css looks inside */ @import url("good.css") html { background-image: url('good_img.png'); } When you open the file - everything looks fine. But if you make a project in IntelliJ IDEA or WebStorm or PHPStorm, then you will see, that both paths are red and there is a warning about non-resolvable path / filename. Would be nice, if there was similar feature in NetBeans.
Doable at least in static web project, where the URLs are likely to point to an existing (in design time) file. Still may produce some false alarms when there's some kind of CSS framework or the project is post-processed during the build.