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Mozilla Developer Network
Check out a free preview of the full CSS3 In-Depth course:
The "Border images" Lesson is part of the full, CSS3 In-Depth course featured in this preview video. Here's what you'd learn in this lesson:
Border images are use a 9-slice scaling technique where the images is “sliced” into nine regions and the corners maintain their aspect ratio while the other regions shrink/grow.
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