One feature that Android has adopted is 9-patch images. The
Android Studio contains a
Draw 9-patch tool which lets you 'create bitmap images that
automatically resize'. Basically you select areas of an image that can be repeated or stretched while others are kept at the same size. Giving you almost SVG functionality for bitmap images, especially great for buttons.
Now this feature would be great for web as well, e.g. responsive design pages. To achieve this we can use the CSS3 feature
border-image which combines
border-image-source, border-image-width, border-image-slice and
border-image-outset.
border-image-source defines which image to use.
border-image-width defines the width of the border image. Stretches or shrinks the image regions to fit the widths.
border-image-slice divides the
image into 9 regions, thereby the name (see the image above) deciding which parts can be repeated/stretched. The regions are: four
corners, four edges and a middle. The fill property decides if the middle should be filled in or kept transparent.
border-image-outset decides how far out from the border the image
will appear. Together with
border-width this enables the border to not take up all the space inside the container caused by it having a wide border to fit the image inside (See
http://www.norabrowndesign.com/css-experiments/border-image-frame.html#one). This is especially great for select/dropdown boxes as they can't work around this by using line-height (
http://stackoverflow.com/questions/18613279/text-over-the-top-of-a-border-image-using-the-border-as-an-expandable-backgroun)
border-image combines the four above properties, but I felt I had more control when splitting them up. However, as of right now browser support for
border-image and especially
border-image-outset is a bit limited. Most browsers support
border-image, but might need browser-specific CSS (e.g.
-webkit-border-image).
Example:
border-style: solid;
border-width: 5px;
border-image-source: url(dropdown.png);
border-image-width: 25% 10% 25% 5%;
border-image-slice: 10 70 20 60 fill;
border-image-outset: 12px;
http://border-image.com lets you generate border-image CSS from an image. but it doesn't put in border-image-outset.
Source:
https://github.com/chrislondon/9-Patch-Image-for-Websites/wiki/What-Are-9-Patch-Images
http://stackoverflow.com/questions/6806559/does-9-patch-png-can-work-somehow-with-css-on-browsers
http://stackoverflow.com/questions/3659457/nine-patch-images-for-web-development
https://teamtreehouse.com/forum/borderimageslice-vs-borderimagewidth