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I include a css: <link href="./css/common.css" rel="stylesheet"> A path kind of './css/common.css' works only if the html placed in a root of Site Root or Sources folder. If the html in a src/html/ or public_html/html/ folder then NetBeans can't load JS or CSS by this url. A path kind of '/css/common.css' does not work at all. I also want to offer the feature. When html placed in Sources folder, would be great if NetBeans could look for css, js and other files in Sources and Site Root folders (for prompts and autocompletion). Because now I'm forced to store css(compiled less) and bower libs in the Site Root and Sources folder.
I recreated your scenario. I have following directory tree public_html/html/css/common.css public_html/html/test.html and in test.html there is link <link href="./css/common.css" rel="stylesheet" type="text/css"/> If I click on ./css/common.css Netbeans open common.css Maybe you want ../css/common.css or something like that if css in in public_html.