Labeling offsite and PDF links automatically, using attribute selectors
Use attribute selectors to label links consistently with this handy formula.
![Labeling a PDF](https://www.oreilly.com/content/wp-content/uploads/sites/2/2020/01/labeling_pdf-f7e64e9a7fc6bdb85c270fef80d60960.jpg)
Learn the ins and outs of CSS with CSS: The Definitive Collection, a series of short and practical ebooks taken from the upcoming book CSS: The Definitive Guide, 4th Edition.